CVE-2026-102866
HIGHCVSS 8.1/10EPSS 0.55%
Last modified
CVE-2026-102866 is a high-severity vulnerability rated 8.1/10 on the CVSS scale. Improper verification of cryptographic signature in Microsoft Office SharePoint allows an unauthorized attacker to elevate privileges over a network.. EPSS estimates a 0.55% chance of exploitation in the next 30 days.
Description
Improper verification of cryptographic signature in Microsoft Office SharePoint allows an unauthorized attacker to elevate privileges over a network.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Sharepoint Server | < 16.0.20326.20190 |
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-102866Patch, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-102866?
Improper verification of cryptographic signature in Microsoft Office SharePoint allows an unauthorized attacker to elevate privileges over a network.
How severe is CVE-2026-102866?
CVE-2026-102866 has a CVSS score of 8.1/10 (HIGH severity). The EPSS model estimates a 0.55% probability of exploitation in the next 30 days.
How do I fix CVE-2026-102866?
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
- Same Subject, Wrong User: A Cross-Issuer Account Takeover in n8nStrix found an identity-binding bug in n8n's token-exchange flow enabling account takeover.
- 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-2026-102860Improper access control in Microsoft Office SharePoint allow…8.8
- CVE-2026-102861Missing authorization in Microsoft Office SharePoint allows …8.8
- CVE-2026-102862Incorrect authorization in Microsoft Office SharePoint allow…8.8
- CVE-2026-102863Improper control of generation of code ('code injection') in…8.8
- CVE-2026-102864Improper neutralization of input during web page generation …4.6
- CVE-2026-102865Incorrect authorization in Microsoft Office SharePoint allow…6.5
- CVE-2026-102867Out-of-bounds read in Microsoft Office Word allows an unauth…6.5
- CVE-2026-102869Access of resource using incompatible type ('type confusion'…8.8
- CVE-2026-10287A vulnerability was determined in SourceCodester SEO Meta Ta…7.3
- CVE-2026-102870Improper control of generation of code ('code injection') in…8.8
- CVE-2026-102874A vulnerability was identified in HKUDS AnyTool 0.1.0. Affec…7.3
- CVE-2026-102875VLC media player before 3.0.24 contains a path traversal vul…7.8
Are you affected by CVE-2026-102866?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST