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Microsoft patches critical Entra ID vulnerability (CVE-2026-69836)
Microsoft patched critical Entra ID RCE CVE-2026-69836 (CVSS 10.0), fully mitigated server-side with no customer action; no in-the-wild exploitation confirmed.
Microsoft patched CVE-2026-69836, a critical (maximum CVSS 10.0) unauthenticated remote code execution flaw in Entra ID caused by deserialization of untrusted data over a network. Entra ID, formerly Azure Active Directory, is Microsoft's cloud identity service verifying logins and controlling access to Microsoft 365, Azure, and connected third-party apps. The flaw was discovered by Microsoft Principal Security Engineer Robert Fitzpatrick and fully mitigated server-side, requiring no customer action. Microsoft initially reported the bug as exploited, but later changed the status to 'no' and confirmed the vulnerability was not exploited in the wild.
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Microsoft Patches Severe Entra ID Flaw (CVSS 10.0) Allowing Remote Code Execution
Microsoft patched CVE-2026-69836 (CVSS 10.0), a deserialization RCE in Entra ID; the flaw was fully mitigated service-side and was not exploited in the wild.
Microsoft disclosed CVE-2026-69836, a CVSS 10.0 remote code execution flaw in Entra ID caused by deserialization of untrusted data, and said the issue was fully mitigated on the service side with no customer action required. The security bulletin initially marked the flaw as exploited, but Microsoft corrected the status to not exploited in the wild on August 21, 2026. Microsoft credited principal security engineer Robert Fitzpatrick with the discovery. The article also recalls the Lazarus Group's exploitation of Windows WinSock AFD zero-day CVE-2026-68820 (CVSS 7.0) in the Operation Dream Job campaign.
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New Passkey Attacks Can Recover Synced Private Keys or Bypass Phishing
Three research teams showed passkey bypasses: WebAuthn assertion replay in Microsoft Entra ID, synced-passkey key recovery in Google Password Manager, and Windows Hello key reuse.
SpecterOps' Pass-the-Passkey research showed Windows stored past YubiKey signatures in cleartext and chained this with Microsoft Entra ID passkey validation weaknesses to impersonate privileged users despite phishing-resistant MFA; the Windows Event Logging Service issue is tracked as CVE-2026-34348 (CVSS 6.5) and fixed in July 2026 updates. Unit 42's Golden Pass-ta-key attack recovered the 32-byte Security Domain Secret protecting Google Password Manager synced passkeys from Chrome on Windows via pre-existing malware. Dirk-jan Mollema showed in-session malware can use a hardware-bound Windows Hello for Business key without a fresh PIN or biometric check. Microsoft applied Entra-side mitigations for the relay assertion issue; no real-world exploitation has been reported.
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ZDI-26-629: Microsoft Azure Entra ID OAuth Device Code Grant Information Disclosure Vulnerability
Zero Day Initiative disclosed an unauthenticated information disclosure vulnerability (CVSS 5.8) in Microsoft Azure Entra ID's OAuth device code grant flow.
ZDI published advisory ZDI-26-629 describing an information disclosure vulnerability in Microsoft Azure Entra ID related to the OAuth device code grant. Remote attackers can disclose sensitive information without authentication. ZDI assigned a CVSS 3.1 score of 5.8; no CVE identifier is listed in the advisory text.
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Microsoft Patch Tuesday, September 2026 Security Update Review
Microsoft's September 2026 Patch Tuesday fixes 974 vulnerabilities, including 113 critical and two actively exploited Windows privilege escalation flaws.
Microsoft's September 2026 Patch Tuesday fixes 974 vulnerabilities, its largest release ever, including 113 critical and 860 important, covering Windows HTTP.sys, Hyper-V, Entra ID, Exchange Server, Office, DNS, and more. Two zero-days are confirmed exploited in the wild: CVE-2026-81963 (Windows Update Stack EoP) and CVE-2026-85880 (ALPC heap overflow), both letting authenticated attackers gain SYSTEM privileges. Notable criticals include an Entra ID authentication bypass (CVE-2026-62916) and multiple Windows DNS Server and Office remote code execution flaws.
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Week in review: High severity WordPress vulnerabilities, fake OAuth IDs bypass sign-in logs
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