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CVE-2026-59118CriticalRevised 11 Aug

Copilot Cowork Elevation of Privilege Vulnerability

MSRC advisory NVD CVE.org

Assessment

Improper authorization in Copilot Cowork allows an unauthorized attacker to elevate privileges over a network.

Severity
Critical
CVSS base score
9.3CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N/E:U/RL:O/RC:C
Impact
Elevation of Privilege
EPSS, next 30 days
0.7%Higher than 51.9% of scored CVEs · FIRST model run 26 Sep 2026 · about EPSS
Exploitability
Not assessed
Publicly disclosed
No
Customer action
Not required (service-side fix)
Component
Copilot Cowork
Weakness
CWE-285: Improper Authorization
Issued by
Microsoft
Published
6 Aug 2026 · August 2026
Last revised
11 Aug 2026Corrected CVE title. This is an informational change only.

Updates that fix it

0 KBs

No KB listed

MSRC lists no downloadable update, which usually means a service-side fix or a release-notes update. Check the MSRC advisory.

Affected products

Microsoft Dynamics
1 affected product
  • Copilot Cowork
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