# CVE-2026-85885 — Microsoft 365 Copilot

> As of 2026-09-19, CVE-2026-85885 is a CRITICAL-severity vulnerability in Microsoft 365 Copilot, CVSS v3.1 9.9, EPSS 0.5% (43.7th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-85885 as of 2026-09-19; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-09-19

## What is CVE-2026-85885?

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 classifies CVE-2026-85885 under weakness class [CWE-77](https://intel.threadlinqs.com/cwe/CWE-77). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs low-privilege credentials, needs no user interaction, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 18 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 9.9 — CRITICAL (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C`)
- **EPSS (FIRST):** 0.5% probability of exploitation in the next 30 days, higher than 43.7% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 6.7/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-09-17, last modified 2026-09-19

## Is CVE-2026-85885 being exploited?

It currently carries a trending score of 40 in the Threadlinqs vulnerability feed.

## Affected products and versions

- [Microsoft](https://intel.threadlinqs.com/vendors/microsoft): 365 Copilot

## How to fix CVE-2026-85885

No vendor patch reference has been recorded for CVE-2026-85885 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-85885

No threat campaign in the Threadlinqs corpus currently references CVE-2026-85885, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org, NVD, FIRST EPSS, GitHub Security Advisories. Last verified by Threadlinqs on 2026-09-19. This product uses the NVD API but is not endorsed or certified by the NVD.

**Vendor advisory and patch**

- [msrc.microsoft.com — vendor advisory](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85885)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-85885
Full detection coverage and IOCs for threats exploiting CVE-2026-85885 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp