CVE-2026-20958: Microsoft SharePoint Information Disclosure Vulnerability

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-01-13 · updated 2026-07-30
Weakness: CWE-918

Description

Server-side request forgery (ssrf) in Microsoft Office SharePoint allows an authorized attacker to disclose information over a network.

Affected products

Microsoft SharePoint Server: before 16.0.19127.20442; 2016, 2019 — fixed in 16.0.19127.20442
Microsoft SharePoint Server Subscription Edition: from 16.0.0 before 16.0.19127.20442 — fixed in 16.0.19127.20442
Microsoft Sharepoint Enterprise Server 2016: from 16.0.0 before 16.0.5535.1001 — fixed in 16.0.5535.1001
Microsoft SharePoint Server: from 16.0.0 before 16.0.10417.20083 — fixed in 16.0.10417.20083

How to fix

Upgrade to a fixed version: Microsoft SharePoint Server 16.0.19127.20442; Microsoft SharePoint Server Subscription Edition 16.0.19127.20442; Microsoft Sharepoint Enterprise Server 2016 16.0.5535.1001; Microsoft SharePoint Server 16.0.10417.20083. Check the vendor advisory for mitigations.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20958

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