CVE-2026-58644
Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.
CVSS Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected Products (3)
| Vendor | Product | Version |
|---|---|---|
| microsoft | sharepoint_server | * < 16.0.19725.20434 |
| microsoft | sharepoint_server | 2016 |
| microsoft | sharepoint_server | 2019 |
GitHub Security Advisory GHSA-q6cq-5qpf-q237
Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker...
References (2)
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58644 Patch, Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-58644 US Government Resource
Risk Scores
Top 7% most likely to be exploited
CISA Known Exploited
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.