CVE-2026-41090CWE-77

Microsoft Copilot Tampering Vulnerability

Critical · published May 22, 2026

CVSS v3.1
9.3
EPSS
1%
Percentile
54.6
In the wild
Unconfirmed
What it is

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

The record
Technical detail
CVSS v3.1
9.3 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N/E:U/RL:O/RC:C
CVSS v4.0
Not supplied
EPSS
0.00756 · 54.6th percentile
Weakness
CWE-77 · Improper Neutralization of Special Elements used in a Command ('Command Injection')
Published
2026-05-22T22:03Z
EPSS history
Timeline
  • 22 MAY 22:03Z
    Microsoft Copilot Tampering Vulnerability
    cvelistv5