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CVE-2026-41090Critical

Microsoft Copilot Tampering Vulnerability

MSRC advisory NVD CVE.org

Assessment

Improper neutralization of special elements used in a command ('command injection') in Microsoft Copilot allows an unauthorized attacker to perform tampering 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
Tampering
EPSS, next 30 days
0.8%Higher than 53.4% of scored CVEs · FIRST model run 29 Sep 2026 · about EPSS
Public exploit code
No Nuclei template lists it
Exploitability
Not assessed
Publicly disclosed
No
Customer action
Not required (service-side fix)
Component
Microsoft Copilot
Weakness
CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection')
Issued by
Microsoft
Published
21 May 2026 · May 2026
Last revised
21 May 2026

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

Apps
1 affected product
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