CVE-2026-6850
Medium · 6.5CVSS
6.5
EPSS
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Published
Jul 13, 2026
CISA due date
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The record
Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to validate the length and content of message attachment field values, which allows an authenticated attacker to cause a denial of service for all users in a channel via a post containing a specially crafted payload that triggers catastrophic backtracking in the client-side markdown parser.. Mattermost Advisory ID: MMSA-2026-00658
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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Related vulnerabilities
- CVE-2026-112901 Pillow is a Python imaging library. CWE-1333
- CVE-2026-106454 Twisted is an event-based framework for internet applications, supporting Python 3.6+. CWE-1333
- CVE-2026-77387 geopy is a geocoding library for Python. CWE-1333
- CVE-2026-102990 basic-ftp is an FTP client for Node.js. CWE-1333
- CVE-2026-102473 A flaw was found in dash. CWE-1333
- CVE-2026-102270 PyJWT is a Python implementation of JSON Web Token standards. CWE-1333
- CVE-2026-101906 Axios is a promise-based HTTP client for the browser and Node.js. CWE-1333
- CVE-2026-101903 Axios is a promise-based HTTP client for the browser and Node.js. CWE-1333