# Microsoft Active Directory Federation Services vulnerabilities Source: https://junglewise.ai/threats/technologies/active-directory-federation-services Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats Updated: 13 November 2026, 03:07 UTC. Rebuilt every hour. Data: https://junglewise.ai/threats/technologies/active-directory-federation-services.json License: CC BY 4.0 with a link back Junglewise Threat Intelligence has tracked 21 vulnerabilities in Microsoft Active Directory Federation Services: 0 in the last 7 days and 12 in the last 90 days, 2 of them critical and 1 exploited in the wild. The most recent, CVE-2026-97788, was published on 13 October 2026. 11 vulnerabilities in the last four weeks, up from none in the four before. 1 critical against 0. ## Counts - Last 7 days: 0 - Last 30 days: 0 - Last 90 days: 12 - All time: 21 (2 critical, 1 exploited in the wild) ## About Microsoft Active Directory Federation Services Microsoft service for managing identity and access across hybrid and cloud environments. ## Latest Microsoft Active Directory Federation Services vulnerabilities - [CVE-2026-97788: Microsoft Active Directory Federation Services information disclosure](https://junglewise.ai/threats/cve-2026-97788-observable-discrepancy-in-active-directory-federation-services-ad) (high, CVSS 7.5, published 13 Oct 2026) - [CVE-2026-96252: Microsoft Active Directory Federation Services cryptographic signature verification bypass](https://junglewise.ai/threats/cve-2026-96252-improper-verification-of-cryptographic-signature-in-active) (critical, CVSS 9.1, published 13 Oct 2026) - [CVE-2026-85324: Microsoft Active Directory Federation Services memory allocation denial of service](https://junglewise.ai/threats/cve-2026-85324-memory-allocation-with-excessive-size-value-in-active-directory) (high, CVSS 7.5, published 13 Oct 2026) - [CVE-2026-85319: Microsoft Active Directory Federation Services resource exhaustion denial of service](https://junglewise.ai/threats/cve-2026-85319-allocation-of-resources-without-limits-or-throttling-in-active) (high, CVSS 7.5, published 13 Oct 2026) - [CVE-2026-83674: Microsoft Active Directory Federation Services weak authentication](https://junglewise.ai/threats/cve-2026-83674-weak-authentication-in-active-directory-federation-services-ad-fs) (high, CVSS 8.1, published 13 Oct 2026) - [CVE-2026-83646: Microsoft Active Directory Federation Services open redirect](https://junglewise.ai/threats/cve-2026-83646-url-redirection-to-untrusted-site-open-redirect-in-active) (medium, CVSS 4.8, published 13 Oct 2026) - [CVE-2026-83645: Microsoft Active Directory Federation Services resource exhaustion denial of service](https://junglewise.ai/threats/cve-2026-83645-allocation-of-resources-without-limits-or-throttling-in-active) (high, CVSS 7.5, published 13 Oct 2026) - [CVE-2026-83511: Microsoft Active Directory Federation Services weak authentication](https://junglewise.ai/threats/cve-2026-83511-weak-authentication-in-active-directory-federation-services-ad-fs) (high, CVSS 7.4, published 13 Oct 2026) - [CVE-2026-70005: Microsoft Active Directory Federation Services weak authentication bypass](https://junglewise.ai/threats/cve-2026-70005-weak-authentication-in-active-directory-federation-services-ad-fs) (medium, CVSS 5.9, published 13 Oct 2026) - [CVE-2026-69982: Microsoft Active Directory Federation Services authentication bypass](https://junglewise.ai/threats/cve-2026-69982-weak-authentication-in-active-directory-federation-services-ad-fs) (medium, CVSS 5.9, published 13 Oct 2026) - [CVE-2026-103576: Microsoft Active Directory Federation Services open redirect](https://junglewise.ai/threats/cve-2026-103576-url-redirection-to-untrusted-site-open-redirect-in-active) (medium, CVSS 6.5, published 13 Oct 2026) - [CVE-2026-72978: Microsoft Active Directory Federation Services resource exhaustion denial of service](https://junglewise.ai/threats/cve-2026-72978-microsoft-active-directory-federation-services-resource) (medium, CVSS 5.9, published 8 Sep 2026) - [CVE-2026-50647: Microsoft AD FS denial of service via infinite loop](https://junglewise.ai/threats/cve-2026-50647-microsoft-ad-fs-denial-of-service-via-infinite-loop) (high, CVSS 7.5, published 14 Jul 2026) - [CVE-2026-50411: Microsoft AD FS stack-based buffer overflow denial of service](https://junglewise.ai/threats/cve-2026-50411-microsoft-ad-fs-stack-based-buffer-overflow-denial-of-service) (high, CVSS 7.5, published 14 Jul 2026) - [CVE-2026-50368: Microsoft Active Directory Federation Services stack overflow denial of service](https://junglewise.ai/threats/cve-2026-50368-microsoft-active-directory-federation-services-stack-overflow) (high, CVSS 7.5, published 14 Jul 2026) - [CVE-2026-50355: Microsoft Active Directory Federation Services stack buffer overflow](https://junglewise.ai/threats/cve-2026-50355-microsoft-active-directory-federation-services-stack-buffer) (high, CVSS 7.5, published 14 Jul 2026) - [CVE-2026-50324: Microsoft AD FS infinite loop denial of service](https://junglewise.ai/threats/cve-2026-50324-microsoft-ad-fs-infinite-loop-denial-of-service) (medium, CVSS 5.9, published 14 Jul 2026) - [CVE-2026-50304: Microsoft Active Directory Federation Services stack overflow DoS](https://junglewise.ai/threats/cve-2026-50304-microsoft-active-directory-federation-services-stack-overflow-dos) (high, CVSS 7.5, published 14 Jul 2026) - [CVE-2026-56155: Microsoft AD FS privilege escalation via insufficient access control granularity](https://junglewise.ai/threats/cve-2026-56155-microsoft-ad-fs-privilege-escalation-via-insufficient-access) (critical, exploited in the wild, CVSS 7.8, published 14 Jul 2026) - [CVE-2026-54983: Microsoft AD FS stack-based buffer overflow denial of service](https://junglewise.ai/threats/cve-2026-54983-microsoft-ad-fs-stack-based-buffer-overflow-denial-of-service) (high, CVSS 7.5, published 14 Jul 2026) - [CVE-2026-50695: Microsoft Active Directory Federation Services stack overflow denial of service](https://junglewise.ai/threats/cve-2026-50695-microsoft-active-directory-federation-services-stack-overflow) (high, CVSS 7.5, published 14 Jul 2026) ## Most severe Microsoft Active Directory Federation Services vulnerabilities - [CVE-2026-56155: Microsoft AD FS privilege escalation via insufficient access control granularity](https://junglewise.ai/threats/cve-2026-56155-microsoft-ad-fs-privilege-escalation-via-insufficient-access) (critical, exploited in the wild, CVSS 7.8, published 14 Jul 2026) - [CVE-2026-96252: Microsoft Active Directory Federation Services cryptographic signature verification bypass](https://junglewise.ai/threats/cve-2026-96252-improper-verification-of-cryptographic-signature-in-active) (critical, CVSS 9.1, published 13 Oct 2026) - [CVE-2026-83674: Microsoft Active Directory Federation Services weak authentication](https://junglewise.ai/threats/cve-2026-83674-weak-authentication-in-active-directory-federation-services-ad-fs) (high, CVSS 8.1, published 13 Oct 2026) - [CVE-2026-83645: Microsoft Active Directory Federation Services resource exhaustion denial of service](https://junglewise.ai/threats/cve-2026-83645-allocation-of-resources-without-limits-or-throttling-in-active) (high, CVSS 7.5, published 13 Oct 2026) - [CVE-2026-85319: Microsoft Active Directory Federation Services resource exhaustion denial of service](https://junglewise.ai/threats/cve-2026-85319-allocation-of-resources-without-limits-or-throttling-in-active) (high, CVSS 7.5, published 13 Oct 2026) - [CVE-2026-85324: Microsoft Active Directory Federation Services memory allocation denial of service](https://junglewise.ai/threats/cve-2026-85324-memory-allocation-with-excessive-size-value-in-active-directory) (high, CVSS 7.5, published 13 Oct 2026) - [CVE-2026-97788: Microsoft Active Directory Federation Services information disclosure](https://junglewise.ai/threats/cve-2026-97788-observable-discrepancy-in-active-directory-federation-services-ad) (high, CVSS 7.5, published 13 Oct 2026) - [CVE-2026-50647: Microsoft AD FS denial of service via infinite loop](https://junglewise.ai/threats/cve-2026-50647-microsoft-ad-fs-denial-of-service-via-infinite-loop) (high, CVSS 7.5, published 14 Jul 2026) - [CVE-2026-50411: Microsoft AD FS stack-based buffer overflow denial of service](https://junglewise.ai/threats/cve-2026-50411-microsoft-ad-fs-stack-based-buffer-overflow-denial-of-service) (high, CVSS 7.5, published 14 Jul 2026) - [CVE-2026-50368: Microsoft Active Directory Federation Services stack overflow denial of service](https://junglewise.ai/threats/cve-2026-50368-microsoft-active-directory-federation-services-stack-overflow) (high, CVSS 7.5, published 14 Jul 2026) ## Vulnerabilities per week 11 vulnerabilities in the last four weeks, up from none in the four before. 1 critical against 0. | Week of | Vulns | Critical | Exploited | | --- | --- | --- | --- | | 17 Aug 2026 | 0 | 0 | 0 | | 24 Aug 2026 | 0 | 0 | 0 | | 31 Aug 2026 | 0 | 0 | 0 | | 7 Sep 2026 | 1 | 0 | 0 | | 14 Sep 2026 | 0 | 0 | 0 | | 21 Sep 2026 | 0 | 0 | 0 | | 28 Sep 2026 | 0 | 0 | 0 | | 5 Oct 2026 | 0 | 0 | 0 | | 12 Oct 2026 | 11 | 1 | 0 | | 19 Oct 2026 | 0 | 0 | 0 | | 26 Oct 2026 | 0 | 0 | 0 | | 2 Nov 2026 | 0 | 0 | 0 | | 9 Nov 2026 | 0 | 0 | 0 | ## Other Microsoft technologies - [Microsoft Windows](https://junglewise.ai/threats/technologies/windows): 2,362 vulnerabilities - [Microsoft Windows 10](https://junglewise.ai/threats/technologies/windows-10): 589 vulnerabilities - [Microsoft Windows 11 24h2](https://junglewise.ai/threats/technologies/windows-11-24h2): 565 vulnerabilities - [Microsoft Windows 11 25h2](https://junglewise.ai/threats/technologies/windows-11-25h2): 534 vulnerabilities - [Microsoft Windows Server 2025](https://junglewise.ai/threats/technologies/windows-server-2025): 534 vulnerabilities - [Microsoft Windows Server 2022](https://junglewise.ai/threats/technologies/windows-server-2022): 528 vulnerabilities - [Microsoft Windows Server 2019](https://junglewise.ai/threats/technologies/windows-server-2019): 521 vulnerabilities - [Microsoft Windows Server 2012](https://junglewise.ai/threats/technologies/windows-server-2012): 517 vulnerabilities - [Microsoft Windows 11](https://junglewise.ai/threats/technologies/windows-11): 494 vulnerabilities - [Microsoft Windows Server 2016](https://junglewise.ai/threats/technologies/windows-server-2016): 476 vulnerabilities - [Microsoft Windows 10 1809](https://junglewise.ai/threats/technologies/windows-10-1809): 380 vulnerabilities - [Microsoft Windows 10 21h2](https://junglewise.ai/threats/technologies/windows-10-21h2): 373 vulnerabilities ## Sources NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "Microsoft Active Directory Federation Services vulnerabilities", https://junglewise.ai/threats/technologies/active-directory-federation-services, 13 November 2026.