CVE-2026-65663
HIGHCVSS 8.8/10
Last modified
CVE-2026-65663 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network..
Description
Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
Metrics
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
Source: CNA advisory (CVE.org). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Microsoft SharePoint Enterprise Server 2016 | >= 16.0.0, < 16.0.5565.1001 |
| Microsoft | Microsoft SharePoint Server 2019 | >= 16.0.0, < 16.0.10417.20198 |
| Microsoft | Microsoft SharePoint Server Subscription Edition | >= 16.0.0, < 16.0.19725.20522 |
References
Timeline
- Published
- Last Modified
- Status
- Undergoing Analysis
Frequently Asked Questions
What is CVE-2026-65663?
Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
How severe is CVE-2026-65663?
CVE-2026-65663 has a CVSS score of 8.8/10 (HIGH severity).
How do I fix CVE-2026-65663?
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-2026-65657Use after free in Microsoft Office allows an unauthorized at…7.8
- CVE-2026-65658Deserialization of untrusted data in Microsoft Office ShareP…8.8
- CVE-2026-6566The Photo Gallery, Sliders, Proofing and Themes – NextGEN Ga…4.3
- CVE-2026-65660Improper control of generation of code ('code injection') in…6.5
- CVE-2026-65661Heap-based buffer overflow in Microsoft Office allows an una…7.8
- CVE-2026-65662Out-of-bounds read in Windows GDI allows an authorized attac…5.5
- CVE-2026-65664Heap-based buffer overflow in Microsoft Office allows an una…7.8
- CVE-2026-65665Deserialization of untrusted data in Microsoft Office ShareP…8.8
- CVE-2026-65667Missing authorization in Microsoft Teams allows an unauthori…10
- CVE-2026-65668Improper access control in Microsoft Purview eDiscovery allo…8.8
- CVE-2026-65671Heap-based buffer overflow in Windows Remote Access API allo…7.8
- CVE-2026-65672Heap-based buffer overflow in Windows Remote Access API allo…7.8
Are you affected by CVE-2026-65663?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST