CVE-2025-20621

HighCVSS 7.5/10Last modified Jun 17, 2026

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.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-1287

Affected software

No affected versions have been published.

Timeline

Published: Jan 16, 2025
Last modified: Jun 17, 2026
NVD status: Analyzed

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