CVE-2026-56155
Last modified
CVE-2026-56155 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. Insufficient granularity of access control in Active Directory Federation Services (AD FS) allows an authorized attacker to elevate privileges locally.. CISA has confirmed active exploitation in the wild. EPSS estimates a 0.38% chance of exploitation in the next 30 days.
Description
Insufficient granularity of access control in Active Directory Federation Services (AD FS) allows an authorized attacker to elevate privileges locally.
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Exploitation Status
This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by .
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Windows 10 1607 | < 10.0.14393.9339 |
| Microsoft | Windows 10 1809 | < 10.0.17763.9020 |
| Microsoft | Windows Server 2012 | All versions |
| Microsoft | Windows Server 2012 | r2 |
| Microsoft | Windows Server 2016 | < 10.0.14393.9339 |
| Microsoft | Windows Server 2019 | < 10.0.17763.9020 |
| Microsoft | Windows Server 2022 | < 10.0.20348.5386 |
| Microsoft | Windows Server 2025 | < 10.0.26100.33158 |
References
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-56155?
How severe is CVE-2026-56155?
How do I fix CVE-2026-56155?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-56148Uncontrolled Recursion (CWE-674) in Elasticsearch can lead t…6.5
- CVE-2026-56149Allocation of Resources Without Limits or Throttling (CWE-77…4.9
- CVE-2026-5615A weakness has been identified in givanz Vvvebjs up to 2.0.5…4.3
- CVE-2026-56150Allocation of Resources Without Limits or Throttling (CWE-77…7.5
- CVE-2026-56151Improper Input Validation (CWE-20) in Kibana can lead to a d…6.5
- CVE-2026-56152Incorrect Authorization (CWE-863) in Elastic Defend can lead…5.3
- CVE-2026-56156Heap-based buffer overflow in Microsoft Office Excel allows …7.8
- CVE-2026-56157Improper access control in Microsoft Office SharePoint allow…5.4
- CVE-2026-56159Heap-based buffer overflow in Windows DHCP Server allows an …9.8
- CVE-2026-5616A security vulnerability has been detected in JeecgBoot 3.9.…7.3
- CVE-2026-56160Improper authorization in Azure Red Hat OpenShift (ARO) allo…9.9
- CVE-2026-56161Improper access control in Azure Logic Apps allows an author…9.6
Are you affected by CVE-2026-56155?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST