CVE-2026-85887CWE-732

CVE-2026-85887

High · published September 18, 2026

CVSS v3.1
7.7
EPSS
1%
Percentile
57.4
In the wild
Unconfirmed
What it is

Incorrect permission assignment for critical resource in M365 Copilot allows an authorized attacker to disclose information over a network.

The record
Technical detail
CVSS v3.1
7.7 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00840 · 57.4th percentile
Weakness
CWE-732 · Incorrect Permission Assignment for Critical Resource
Published
2026-09-18T04:17Z
Affected products (1)
ProductVersionsFixed in
microsoft/365_copilotall versions—
References (1)
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85887 · [email protected]
EPSS history
Timeline
  • 19 SEP 03:54Z
    EPSS moved — → 0%
    epss
  • 17 SEP 23:04Z
    M365 Copilot Information Disclosure Vulnerability
    cvelistv5