CVE-2026-55006
HIGHCVSS 7.8/10EPSS 0.22%
Last modified
CVE-2026-55006 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. Insufficient granularity of access control in Microsoft Exchange Server allows an authorized attacker to elevate privileges locally.. EPSS estimates a 0.22% chance of exploitation in the next 30 days.
Description
Insufficient granularity of access control in Microsoft Exchange Server allows an authorized attacker to elevate privileges locally.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions | Update |
|---|---|---|---|
| Microsoft | Exchange Server | 2016 | Cumulative Update 23 |
| Microsoft | Exchange Server | 2019 | Cumulative Update 14 |
| Microsoft | Exchange Server Subscription Edition | < 15.02.2562.045 | — |
References
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-55006?
Insufficient granularity of access control in Microsoft Exchange Server allows an authorized attacker to elevate privileges locally.
How severe is CVE-2026-55006?
CVE-2026-55006 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.22% probability of exploitation in the next 30 days.
How do I fix CVE-2026-55006?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
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-2026-55000Use after free in Windows USB Print Driver allows an unautho…6.4
- CVE-2026-55001Improper certificate validation in Windows Active Directory …7.8
- CVE-2026-55002External control of file name or path in SQL Server allows a…8.8
- CVE-2026-55003Use of uninitialized resource in Windows RDP allows an unaut…6.5
- CVE-2026-55004Double free in Microsoft Printer Drivers allows an authorize…7.8
- CVE-2026-55005Heap-based buffer overflow in Microsoft Exchange Server allo…8.8
- CVE-2026-55007Double free in Microsoft Exchange Server allows an unauthori…8.1
- CVE-2026-55008Improper neutralization of input during web page generation …9.6
- CVE-2026-55009Deserialization of untrusted data in Microsoft Exchange Serv…7.8
- CVE-2026-5501wolfSSL_X509_verify_cert in the OpenSSL compatibility layer …8.1
- CVE-2026-55010Heap-based buffer overflow in Minecraft Bedrock Dedicated Se…9.8
- CVE-2026-55011Integer underflow (wrap or wraparound) in Microsoft Defender…7.8
Are you affected by CVE-2026-55006?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST