CVE-2025-20621 MEDIUM

CVE-2025-20621: Webapp crash via object that can't be cast to String in Attachment Field

Vendor Mattermost
Product Mattermost
Weakness CWE-1287
Published January 16, 2025
Last update January 16, 2025
View on NVD All CVEs

CVSS base score

6.5/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality None
Integrity None

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

January 16, 2025 CVE published
January 16, 2025 Record updated