VULNERABILITY INTELLIGENCE

CVE-2025-20621

CVSS score6.5 MEDIUM
EPSS probability0.48%
CISA KEVNot currently listed
Published2025-01-16
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Description

Mattermost versions 10.2.x <= 10.2.0, 9.11.x <= 9.11.5, 10.0.x <= 10.0.3, 10.1.x <= 10.1.3 fail to properly handle posts with attachments containing fields that cannot be cast to a String, which allows an attacker to cause the webapp to crash via creating and sending such a post to a channel.

Weakness classification

  • responsibledisclosure@mattermost.com: CWE-1287

Primary references