CVE-2026-41090: Microsoft Copilot Tampering Vulnerability

Severity: critical (CVSS 9.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-05-22 · updated 2026-08-10
Weakness: CWE-77

Description

Improper neutralization of special elements used in a command ('command injection') in Microsoft Copilot allows an unauthorized attacker to perform tampering over a network.

Affected products

Microsoft 365 Copilot: all versions
Microsoft 365 Copilot: all versions

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-41090

Get alerted when CVE-2026-41090 or the next vulnerability affects your stack