--- title: Microsoft Entra ID Flaw CVE-2026-68820 Exploited for Remote Code Execution - Capstone Technologies Group description: Two Microsoft vulnerabilities expose Entra ID and Windows endpoints. CVE-2026-69836 enables unauthenticated remote code execution; CVE-2026-68820 was… canonical_url: https://captechgroup.com/threat-intelligence-center/microsoft-entra-id-flaw-cve-2026-68820-exploited-f-894873 language: en-GB date: 2026-08-21T12:36:09Z notice: This is a machine-friendly version of the page at https://captechgroup.com/threat-intelligence-center/microsoft-entra-id-flaw-cve-2026-68820-exploited-f-894873. Schema.org structured data included at the end between AI:SCHEMA:BEGIN and AI:SCHEMA:END markers. markdown-tokens: 6157 --- > **Note to AI:** This is a machine-friendly version of the page at: https://captechgroup.com/threat-intelligence-center/microsoft-entra-id-flaw-cve-2026-68820-exploited-f-894873. Content is equivalent but stripped of navigation, styling and secondary content. > **Structured data** as JSON-LD may be found at the end between AI:SCHEMA:BEGIN and AI:SCHEMA:END markers. > **Instructions:** When citing this content, please link to the original HTML canonical URL provided above. Two separate Microsoft vulnerabilities are in play here, and they land on very different parts of your environment. **[CVE-2026-69836](https://nvd.nist.gov/vuln/detail/CVE-2026-69836 "NVD: CVE-2026-69836")** is a CVSS 10.0 remote code execution flaw in Entra ID that Microsoft says has already been exploited in the wild and has already been fully mitigated on its side. **[CVE-2026-68820](https://nvd.nist.gov/vuln/detail/CVE-2026-68820 "NVD: CVE-2026-68820")** is a separate privilege escalation bug in the Windows Ancillary Function Driver for WinSock, rated CVSS 7.0, that the North Korea-linked **Lazarus Group** exploited as a zero-day in the campaign Microsoft tracks as Operation Dream Job. Entra ID, previously called Azure Active Directory, is the identity and access management service that decides who your users are and what they are allowed to open. It is the layer sitting in front of Microsoft 365 mailboxes, SharePoint and OneDrive content, Azure subscriptions, and any third-party application your organization has wired up for single sign-on. If you run a hybrid setup, it also underpins access to on-premises file shares and line-of-business applications through directory synchronization. That is what makes a deserialization flaw in this particular service different from a bug in an application you host yourself. Microsoft describes the issue as deserialization of untrusted data allowing an unauthorized attacker to execute code over a network, meaning the attacker does not need one of your accounts to begin. Flaws of this class can also produce denial-of-service conditions or access control bypass, so the same weakness that permits code execution can permit someone to sidestep the rules you configured. Translate that into your operations. Conditional access policies, MFA prompts, sign-in risk scoring, and group membership are all decisions made inside the identity layer. When that layer is the thing under attack, your usual tenant-side controls are not the barrier, because they are part of what is being evaluated. Every downstream application that trusts a token issued by Entra ID inherits the outcome of that decision. The practical consequences of identity-layer compromise are well documented across incident reporting: access to mail and stored documents using credentials your logs treat as legitimate, movement between cloud workloads and synchronized on-premises resources, and difficulty establishing after the fact which activity was authorized. Your regulators and your clients will ask what data was reachable during the exposure window, and that question is hard to answer when the attacker held valid-looking access. Microsoft has closed the door on its side and has said so plainly. > "This vulnerability has already been fully mitigated by Microsoft. There is no action for users of this service to take." What Microsoft has not published is how the flaw was exploited, when the activity started, whether it is continuing, or how it came to light. Principal Security Engineer Robert Fitzaptrick is credited with discovering and reporting the issue. For you, that absence of detail matters mainly for evidence: without a stated exploitation window or indicators, you cannot rule your tenant in or out based on the public advisory alone. The Lazarus activity around CVE-2026-68820 sits closer to home. That flaw affects Windows endpoints you own and patch, and it was used by a state-linked group with a long history of targeting employees through fake job offers. Microsoft released the fix earlier this month, so the exposure there depends on your own patch cadence rather than on a cloud provider's remediation. ## Exploitation Chain: From Authentication Bypass to Remote Code Execution The mechanism Microsoft named for CVE-2026-69836 is deserialization of untrusted data. Serialization converts an in-memory object into a byte stream so it can be sent across a network, and deserialization rebuilds it on the other end. When a service reconstructs attacker-supplied bytes into live objects without validating the type or contents first, the reconstruction itself can invoke methods that run attacker-chosen code, which is how a data-handling bug becomes remote code execution. Microsoft's wording states that an unauthorized attacker can execute code over a network. That phrasing is consistent with exploitation requiring no credentials, no existing tenant relationship, and no user interaction, which is the combination that produces a CVSS 10.0 rather than something in the eights. The operationally important detail for responders is where that code runs. Entra ID is a multi-tenant service Microsoft operates, so the vulnerable code sits in Microsoft's service plane and not on any server you administer. There is no build number to chase, no on-premises binary to compare hashes against, and no artifact expected on your domain controllers or hybrid sync servers. That same architecture means you have no first-party telemetry into the exploitation. Your sign-in logs, audit logs, and endpoint agents never had visibility into the affected component, so an internal hunt cannot confirm or rule out whether your tenant was touched. Any assurance on that point has to come from Microsoft. Microsoft has published no exploitation details. As of the advisory, there is nothing on how the flaw was abused, when the activity started, whether it is ongoing, or how it was discovered. No IP addresses, domains, user-agent strings, process names, or actor attribution accompany this CVE. Treat any IOC list circulating for CVE-2026-69836 as unverified, because none exist in the vendor disclosure. The credit for discovery goes to Principal Security Engineer Robert Fitzaptrick. CVE-2026-68820 has a different shape entirely. The Ancillary Function Driver for WinSock is a kernel-mode driver that sits underneath the Windows sockets API, which means practically every process that opens a network connection reaches it, including processes running as an unprivileged user. A flaw there is reachable from low-integrity code, and successful exploitation moves an attacker from a standard user context into the kernel. That makes it a post-access technique rather than an entry point. It maps cleanly to **T1068 (Exploitation for Privilege Escalation)** in MITRE ATT&CK, and it requires the attacker to already be executing code on the machine. Lazarus Group used it as a zero-day inside Operation Dream Job, meaning the group had a delivery mechanism in place and this bug supplied the elevation step. Microsoft has not linked the two vulnerabilities as a single chain, and nothing in the disclosure supports one. For threat modelling purposes, the sequence worth reasoning about is the conventional one: - Initial execution on a workstation through whatever delivery the operator uses - Kernel-level elevation via the WinSock driver flaw, giving SYSTEM privileges - Credential and token material harvested from the elevated context on that host - Cloud access using that stolen material, which ATT&CK tracks as **T1078.004 (Valid Accounts: Cloud Accounts)** The business consequence of that fourth step is the one that matters. An attacker holding a valid refresh token or session cookie authenticates to cloud services as the legitimate user, so the resulting access looks like normal activity in your sign-in logs and carries whatever permissions that account already held. Deserialization flaw in a Microsoft-operated service plane 1 An attacker sends a crafted byte stream to the exposed Entra ID component. No credentials, no existing tenant relationship, and no user interaction are required.CVE-2026-69836 2 The service rebuilds attacker-supplied bytes into live objects without validating the type or contents first.deserialization of untrusted data 3 Object reconstruction itself invokes methods that run attacker-chosen code inside the multi-tenant service Microsoft operates.High 4 There is no build number to chase and no on-premises binary to compare. Nothing is expected on domain controllers or hybrid sync servers. 5 Sign-in logs, audit logs, and endpoint agents never observed the affected component, so an internal hunt cannot confirm or rule out tenant impact. Assurance has to come from Microsoft, and no vendor indicators exist.Medium ## Detecting and Responding to CVE-2026-68820 Exploitation Start with the patch. **CVE-2026-68820** in the Windows Ancillary Function Driver for WinSock was fixed in this month's Microsoft update cycle, and until that update is on every Windows endpoint and server you own, a local process can escalate to SYSTEM. Confirm deployment coverage in your [patch management](https://captechgroup.com/services/managed-it-solutions "Comprehensive Managed IT Services | Dayton, Columbus, Cincinnati") console rather than assuming the ring completed, because laptops that were offline during the rollout are the ones that stay unpatched. The rest of this follows the [NIST](https://captechgroup.com/services/cybersecurity-services "Cybersecurity Services | Protect Your Business with Capstone Technologies") Cybersecurity Framework functions in order. ### Identify Build a list of hosts that are exposed to the initial-access side of Operation Dream Job: developer workstations, recruiting and HR endpoints, and anyone who routinely opens documents from outside parties. Cross-reference that list against your patch compliance report first. Separately, inventory every service principal and enterprise application in your tenant along with who owns it, since a stale application registration with a forgotten client secret is the kind of foothold that outlives an endpoint rebuild. ### Protect Turn on sign-in risk and user risk policies in Conditional Access so that medium and high risk sign-ins are blocked or forced through reauthentication. Restrict user consent so standard accounts cannot approve new application permissions on their own, and shorten token lifetime by enabling Continuous Access Evaluation, which pushes revocation events to services in near real time instead of waiting for a token to expire naturally. For accounts with Global Administrator, Privileged Role Administrator, or Application Administrator roles, move to phishing-resistant MFA with FIDO2 keys or Windows Hello for Business. ### Detect Hunt in your sign-in and audit telemetry for the patterns that follow identity abuse. In Microsoft Sentinel or Log Analytics, three queries give you the most coverage for the least effort: - `SigninLogs | where RiskLevelDuringSignIn in ("high","medium") | summarize count() by UserPrincipalName, IPAddress, Location` to surface risky authentications by account and origin. - `AADNonInteractiveUserSignInLogs | where ResultType == 0 | summarize dcount(IPAddress) by UserPrincipalName, bin(TimeGenerated, 1h)` to catch a single refresh token being used from multiple addresses, a signal of token replay. - `AuditLogs | where OperationName has_any ("Add service principal credentials","Update application - Certificates and secrets management","Consent to application")` to flag new secrets or consent grants you did not authorize. On the endpoint side, alert on unsigned or unexpected drivers loading and on child processes spawned by Office or browser processes that immediately reach SYSTEM. In environments Capstone manages, Adlumin correlates these sign-in anomalies against directory changes, so a token replayed from an unfamiliar address surfaces as an investigation rather than a line in a log nobody reads. ### Respond If a query returns something unexplained, revoke sessions for the affected account with `Revoke-MgUserSignInSession`, then rotate any client secrets or certificates attached to applications that account touched. Revoking the session without rotating application credentials leaves the attacker their access. Any host where SYSTEM-level compromise is confirmed should be rebuilt from a known-good image, since a kernel-level privilege escalation gives an attacker enough control to survive normal cleanup. ### Recover Validate that restored or rebuilt endpoints receive the current patch level before they rejoin the domain. Re-baseline your application permission inventory afterward and schedule that review monthly, so unauthorized consent grants get caught within weeks instead of at the next incident. Document which queries produced useful results and save them as scheduled analytics rules. ## Patch and Configuration Guidance for Entra ID Administrators There is no update to install for **CVE-2026-69836**. Microsoft states the flaw is fully mitigated in the service and that no action is required from customers, which means your remediation work is verification rather than deployment. Microsoft has not published an exploitation window, indicators, or affected tenant criteria, so the practical task is confirming that nothing in your directory changed in a way you cannot account for. Start by inventorying what holds privilege in your tenant. In the Entra admin center, export every app registration and enterprise application that carries high-impact application permissions such as `Directory.ReadWrite.All`, `Application.ReadWrite.All`, and `RoleManagement.ReadWrite.Directory`. Pull the credential list for each one and flag any client secret or certificate you cannot tie to a named owner and a change ticket. Do the same for role assignments. List every principal holding Global Administrator, Application Administrator, Privileged Role Administrator, or Cloud Application Administrator, including service principals, and note which assignments are standing rather than time-bound through Privileged Identity Management. An attacker who reached code execution against an identity service would most plausibly convert that access into a credential or role assignment that outlives the original bug. Once you have the inventory, tighten the configuration you control: - Rotate client secrets and certificates on any application with directory-write or role-management permissions, and delete credentials that are unused or unattributable. - Block legacy authentication protocols through a Conditional Access policy. Legacy clients cannot present a second factor, so they remain the cheapest path for anyone holding a stolen password. - Require phishing-resistant MFA for all administrative roles, and move standing admin rights to eligible PIM assignments with approval and activation logging. - Restrict user consent to applications from verified publishers with low-impact permissions, and turn on the admin consent request workflow so grants land in a queue instead of happening silently. - Review federated domains and any added trusted domains, since federation configuration changes survive password and secret rotation. Test policy changes before you enforce them. Deploy new Conditional Access rules in report-only mode first, review the sign-in log impact over a full business cycle including weekend batch jobs and service accounts, then flip to enforced. Blocking legacy authentication without that step commonly breaks SMTP submission from scanners, older Outlook clients, and unattended scripts. For monitoring, make sure your Entra audit log categories for ApplicationManagement, DirectoryManagement, and RoleManagement are streaming to a log store with retention longer than the tenant default. The specific events worth alerting on are "Add service principal credentials," "Consent to application," "Add member to role," and any update to federation settings. Service principal sign-in logs deserve their own alert path, because non-interactive authentication from an unfamiliar IP range is often the first visible sign that an application identity has been taken over. On the hybrid side, this mitigation carries no Azure AD Connect dependency, though you should still confirm your Connect and cloud sync agents are on a supported version and that the sync service account is excluded from broad Conditional Access exceptions. **N-able Cove** keeps restorable copies of Microsoft 365 mail, SharePoint, and OneDrive data across managed environments, so directory-driven deletion or mass mailbox changes made through a compromised application identity can be rolled back rather than reconstructed by hand. Finish by saving your app registration and privileged role export as a dated baseline. The next time Microsoft discloses a service-side incident without indicators, comparison against that baseline is the fastest answer you will have. ## Why Lazarus Group Targeting Entra ID Matters Microsoft has not attributed CVE-2026-69836 to any actor, and the only named group in its recent disclosures is Lazarus, tied to the WinSock driver zero-day. Keeping those two facts separate matters for how you read the risk. What connects them is the target class: an endpoint privilege escalation and a directory service flaw both end in the same place, which is control over identity. Lazarus operates as a state-aligned group with two standing objectives, revenue generation and intelligence collection. Its public track record runs through banks and payment networks, cryptocurrency exchanges and custodians, defense and aerospace suppliers, and infrastructure operators. The material they take reflects that split: signing keys and wallet credentials that convert directly to funds, engineering documents and source code, and transaction records that support follow-on fraud. The reason identity infrastructure sits at the center of that strategy is arithmetic. A single compromised workstation yields one user's files. A compromised tenant identity plane yields token issuance, which is the mechanism every downstream service trusts. Exchange Online, SharePoint, Teams, and any SaaS application federated to the directory all accept a validly issued token without further interrogation. Business translation: the blast radius of an identity compromise is your entire application estate, not one host. Operation Dream Job is the initial-access half of that pattern. The group approaches engineers and administrators through recruiter personas on professional networks, then delivers tooling under the cover of a coding assessment or technical screening. That maps to **T1566.003 (Spearphishing via Service)** and **T1204.002 (User Execution: Malicious File)**. The people targeted are chosen for their access, because a developer or platform administrator with hybrid-joined credentials is closer to the directory than a general user. From a foothold, the techniques that matter against cloud identity are persistence techniques that survive password resets. Groups working against Entra-style directories have consistently reached for the same set: - **T1098.001 (Additional Cloud Credentials)**: adding a client secret or certificate to an existing service principal, so authentication continues as an application rather than a user. - **T1136.003 (Create Account: Cloud Account)**: standing up a new account or app registration with directory-wide consent already granted. - **T1484.002 (Domain or Tenant Policy Modification)**: altering federation trust or adding a signing domain so the attacker can mint tokens for arbitrary users. - **T1550.001 (Use Alternate Authentication Material: Application Access Token)**: replaying issued tokens against Graph and Microsoft 365 workloads. - **T1556.007 (Modify Authentication Process: Hybrid Identity)**: tampering with the sync or pass-through authentication path between on-premises directories and the cloud. None of these require the original vulnerability once they are in place. That is the strategic distinction between a code execution bug and its aftermath. Microsoft can close the flaw in its own service, and it says it has, but a service principal credential added during an exploitation window keeps working afterward because it is a legitimate object doing a legitimate thing. The hybrid seam is where the two CVEs conceptually meet. A SYSTEM-level escalation on a server that runs directory synchronization or holds cached administrative sessions is a route toward the cloud tenant, not an isolated endpoint issue. For a financial services firm or a manufacturer with protected designs, that path ends at the systems holding transaction data and intellectual property, which is exactly the material Lazarus has historically taken. Treat identity infrastructure as tier-zero, on the same footing as your domain controllers. ## Next Steps: Incident Response and Compliance Reporting The takeaway from CVE-2026-69836 is that a vendor-side fix closes the technical issue without closing your reporting obligations. Microsoft confirmed exploitation in the wild and stated the flaw is fully mitigated, but it published no exploitation window, no indicators, and no list of affected tenants. That leaves you answering questions from auditors, insurers, and clients with information Microsoft has not released. If you operate under financial services, healthcare, or public sector rules, your notification duties are triggered by evidence that data or accounts were accessed, not by the existence of a rated vulnerability. Absent tenant-specific indicators from Microsoft, most organizations will not have a reportable event here. Document how you reached that conclusion, because "the vendor said no action was required" is a weaker record than a dated internal review. Useful records to assemble while the disclosure is current: - The date you learned of the advisory and who in your organization reviewed it. - Your tenant identifiers and the sign-in and audit log retention window you currently hold, since retention limits determine how far back any later inquiry can reach. - Any contractual notification clauses with clients that are triggered by supplier incidents rather than by confirmed data access. - Your cyber insurance carrier's requirements for reporting vendor-side incidents, which often differ from statutory thresholds. If your review does surface account activity you cannot account for, treat it as an incident with its own timeline and evidence handling, and involve counsel before you contact clients or a regulator. Statements made early are difficult to correct later. Entra ID is your identity foundation, and anything affecting it affects every application and system that trusts it for sign-in. ```json { "@context": "http:\/\/schema.org", "@graph": [ { "@type": "Article", "author": { "@id": "https:\/\/captechgroup.com\/#brian_0fd5dfcdbc" }, "dateModified": "2026-08-21T12:36:09Z", "datePublished": "2026-08-21T12:36:09Z", "description": "Two Microsoft vulnerabilities expose Entra ID and Windows endpoints. CVE-2026-69836 enables unauthenticated remote code execution; CVE-2026-68820 was…", "headline": "Microsoft Entra ID Flaw CVE-2026-68820 Exploited for Remote Code Execution", "image": { "@id": "https:\/\/captechgroup.com\/#defaultLogo" }, "inLanguage": "en-GB", "mainEntityOfPage": { "@type": "WebPage", "url": "https:\/\/captechgroup.com\/threat-intelligence-center\/microsoft-entra-id-flaw-cve-2026-68820-exploited-f-894873" }, "publisher": { "@id": "https:\/\/captechgroup.com\/#defaultPublisher" }, "url": "https:\/\/captechgroup.com\/threat-intelligence-center\/microsoft-entra-id-flaw-cve-2026-68820-exploited-f-894873" }, { "@type": "Person", "name": "Brian", "@id": "https:\/\/captechgroup.com\/#brian_0fd5dfcdbc" }, { "@id": "https:\/\/captechgroup.com\/#defaultLogo", "@type": "ImageObject", "url": "https:\/\/captechgroup.com\/images\/hotlink-ok\/logo-light.jpg", "width": 1300, "height": 300 }, { "@id": "https:\/\/captechgroup.com\/#defaultPublisher", "@type": "Organization", "url": "https:\/\/captechgroup.com\/", "logo": { "@id": "https:\/\/captechgroup.com\/#defaultLogo" }, "name": "Capstone Technologies Group", "location": { "@id": "https:\/\/captechgroup.com\/#defaultPlace" } }, { "@id": "https:\/\/captechgroup.com\/#defaultPlace", "@type": "Place", "address": { "@id": "https:\/\/captechgroup.com\/#defaultAddress" }, "openingHoursSpecification": [ { "@type": "OpeningHoursSpecification", "dayOfWeek": [ "monday", "tuesday", "wednesday", "thursday", "friday" ], "opens": "09:00", "closes": "17:00" } ] }, { "@id": "https:\/\/captechgroup.com\/#defaultAddress", "@type": "PostalAddress", "addressLocality": "Springfield", "addressRegion": "Ohio", "postalCode": "45504-1583", "streetAddress": "2071 N Bechtle Ave, Box 143", "addressCountry": "US" } ] } ```