CVE-2026-85885CWE-77command-injection

CVE-2026-85885

Critical · published September 18, 2026

CVSS v3.1
9.9
EPSS
1%
Percentile
53.4
In the wild
Unconfirmed
What it is

Improper neutralization of special elements used in a command ('command injection') in M365 Copilot allows an authorized attacker to elevate privileges over a network.

The record
Technical detail
CVSS v3.1
9.9 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00720 · 53.4th percentile
Weakness
CWE-77 · Improper Neutralization of Special Elements used in a Command ('Command Injection')
Published
2026-09-18T03:18Z
Affected products (1)
ProductVersionsFixed in
microsoft/365_copilotall versions—
References (1)
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85885 · [email protected]
EPSS history
Timeline
  • 19 SEP 03:54Z
    EPSS moved — → 1%
    epss
  • 17 SEP 22:55Z
    Microsoft 365 Copilot Elevation of Privilege Vulnerability
    cvelistv5