CVE-2026-42827CWE-77

M365 Copilot Information Disclosure Vulnerability

Medium · published May 22, 2026

CVSS v3.1
6.5
EPSS
1%
Percentile
60.0
In the wild
Unconfirmed
What it is

Improper neutralization of special elements used in a command ('command injection') in M365 Copilot allows an unauthorized attacker to disclose information over a network.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C
CVSS v4.0
Not supplied
EPSS
0.00922 · 60.0th 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
    M365 Copilot Information Disclosure Vulnerability
    cvelistv5