Time-of-check Time-of-use (TOCTOU) Race Condition in Microsoft SharePoint Server - CVE-2026-69804
Published: September 8, 2026
Vulnerability identifier: #VU147963
CSH Severity: Low
CVSS v4: 7.7 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-69804
CWE-ID: CWE-367
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to execute arbitrary code.
The vulnerability exists due to a time-of-check time-of-use race condition in Microsoft Office SharePoint when winning a race condition. A remote user can win a race condition to execute arbitrary code.
Affected software
Microsoft SharePoint Server
How to mitigate CVE-2026-69804
Install security update from vendor's website.
Microsoft SharePoint Server - update to 16.0.20326.20090