High severity8.8NVD Advisory· Published Aug 11, 2026· Updated Aug 13, 2026
CVE-2026-64921
CVE-2026-64921
Description
Missing authentication for critical function in Microsoft Office SharePoint allows an authorized attacker to elevate privileges over a network.
Affected products
5(expand)+ 3 more
- (no CPE)
- cpe:2.3:a:microsoft:sharepoint_server:*:*:*:*:subscription:*:*:*range: <16.0.19725.20522
- cpe:2.3:a:microsoft:sharepoint_server:2016:*:*:*:enterprise:*:*:*
- cpe:2.3:a:microsoft:sharepoint_server:2019:*:*:*:*:*:*:*
Patches
Vulnerability mechanics
References
1- msrc.microsoft.com/update-guide/vulnerability/CVE-2026-64921nvdVendor AdvisoryPatch
News mentions
6- Microsoft Patch Tuesday for August 2026 — Snort rules and prominent vulnerabilitiesCisco Talos Intelligence · Aug 11, 2026
- Patch Tuesday - August 2026Rapid7 Blog · Aug 11, 2026
- Microsoft's August 2026 Patch Tuesday addresses 398 CVEs (CVE-2026-68820)Tenable Blog · Aug 11, 2026
- Microsoft Patch Tuesday Update August 2026 – 394 Vulnerabilities Fixed, Including 3 Zero-DaysCyber Security News · Aug 11, 2026
- Microsoft SharePoint: 21 Vulnerabilities Disclosed, Ranging from RCE to Privilege EscalationVypr Intelligence · Aug 11, 2026
- August 2026 Patch Tuesday: One Exploited Zero-Day and 62 Critical Vulnerabilities Among 415 CVEsCrowdStrike Blog