Reference page — cumulative record through Saturday, October 3, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-85885

CVE-2026-85885HIGH

Microsoft 365 Copilot Elevation of Privilege Vulnerability

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   L   N  U  H  H  H    8.8   .0072   52.3     —

AFFECTED
  Product                Versions  Fixed
  Microsoft 365 Copilot  - –       —

TIMELINE
  Sep 4   Reserved by microsoft
  Sep 17  Published (CNA: microsoft)
  Sep 25  RESCORED — CVE-2026-85885 (Microsoft 365 Copilot). CVSS 9.9 → 8.8 (NVD).

CWE-77 · CNA: microsoft · CVSS v3.1 · 1 reference · NVD status: Analyzed

Description

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

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
September 4, 2026	Reserved	Reserved by microsoft
September 17, 2026	Published	Published (CNA: microsoft)
September 25, 2026	RESCORED	RESCORED — CVE-2026-85885 (Microsoft 365 Copilot). CVSS 9.9 → 8.8 (NVD).

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Microsoft	Microsoft 365 Copilot	—	-	—

Weaknesses

CWE-77

References (1)

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85885 [vendor-advisory, patch]

Authoritative record: CVE-2026-85885 at cve.org

Vendors: microsoft

Weaknesses: CWE-77

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-85885 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Saturday, October 3, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.