CVE-2026-85887

high

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

Vendor / product: Microsoft — 365 copilot

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

CVSS

7.7

7.7 (CVSS v3.1)

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

Severity source: NVD CVSS v3.1 (secure@microsoft.com)

Timeline (UTC)

Published: 2026-09-18 00:17

Modified: 2026-09-28 18:37

NVD status: Analyzed

Last synced 2 days ago

Verified against the source API 2026-10-27 06:54 UTC

Exploitation

Not listed in CISA KEV (as of last catalog sync)

Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).

Affected products

microsoft / 365_copilot all versions

Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.

NVD CVE API 2.0 — fetched 2026-10-27 06:54 UTC · record ↗