CVE-2026-50522
Last modified
CVE-2026-50522 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.. CISA has confirmed active exploitation in the wild. EPSS estimates a 21.04% chance of exploitation in the next 30 days.
Description
Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/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 | Sharepoint Server | < 16.0.19725.20434 |
| Microsoft | Sharepoint Server | 2016 |
| Microsoft | Sharepoint Server | 2019 |
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50522Patch, Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-50522US Government Resource
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-50522?
How severe is CVE-2026-50522?
How do I fix CVE-2026-50522?
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-2026-50517Deserialization of untrusted data in M365 Copilot allows an …9.9
- CVE-2026-50518Heap-based buffer overflow in Windows DHCP Server allows an …9.8
- CVE-2026-50519Initialization of a resource with an insecure default in Git…7.5
- CVE-2026-5052Vault’s PKI engine’s ACME validation did not reject local ta…8.6
- CVE-2026-50520Improper neutralization of special elements used in a comman…8.4
- CVE-2026-50521Use after free in Microsoft Edge (Chromium-based) allows an …8.3
- CVE-2026-50524Improper validation of specified type of input in .NET Frame…7.5
- CVE-2026-50525Allocation of resources without limits or throttling in .NET…7.5
- CVE-2026-50526Improper link resolution before file access ('link following…5.5
- CVE-2026-50527Stack-based buffer overflow in .NET Framework allows an unau…7.5
- CVE-2026-50528Incorrect authorization in .NET allows an unauthorized attac…8.2
- CVE-2026-50529DataEase is an open source data visualization and analysis t…8.7
Are you affected by CVE-2026-50522?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST