# CVE-2026-24301 — Microsoft Copilot Web

> As of 2026-08-18, CVE-2026-24301 is a HIGH-severity vulnerability in Microsoft Copilot Web, CVSS v3.1 8.8. Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-24301, most recently “Critical Microsoft Copilot CoSnitch Vulnerability (CVE-2026-24301) Enabled One-Click Data Theft From Connected Accounts”.

**Last updated:** 2026-08-18

## What is CVE-2026-24301?

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

The record classifies CVE-2026-24301 under weakness class [CWE-77](https://cwe.mitre.org/data/definitions/77.html). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs a user to take an action first, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 36 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 8.8 — HIGH (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C`)
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 4.4/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-08-18

## Is CVE-2026-24301 being exploited?

No public exploitation evidence for CVE-2026-24301 is recorded in the sources Threadlinqs tracks — CISA KEV, Exploit-DB, public proof-of-concept repositories and ProjectDiscovery Nuclei — as of 2026-08-18. That is an absence of evidence in those feeds, not a guarantee that the vulnerability is unexploited.

## Affected products and versions

- **Microsoft**: Copilot Web

## How to fix CVE-2026-24301

No vendor patch reference has been recorded for CVE-2026-24301 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-2026-24301

1 tracked threat in the Threadlinqs corpus references CVE-2026-24301, either in the campaign’s CVE list or as an indicator on the campaign record.

- [Critical Microsoft Copilot CoSnitch Vulnerability (CVE-2026-24301) Enabled One-Click Data Theft From Connected Accounts](https://intel.threadlinqs.com/threat/TL-2026-2065) — CRITICAL · 2026-08-19

## Sources

Enriched from CVE.org, NVD. Last verified by Threadlinqs on 2026-08-19. 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-2026-24301)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-24301
Full detection coverage and IOCs for threats exploiting CVE-2026-24301 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp