Unrated
Webapp crash via object that can't be cast to String in Attachment Field
CVE-2025-20621
First seen on SecPulse
Original description The description as published by the source.
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.
Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV
References
- advisory github.com
- advisory nvd.nist.gov
- web mattermost.com