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CVE-2025-20621: Webapp crash via object that can't be cast to String in Attachment Field
6.5
CVSS
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.
Classification
CVE ID: CVE-2025-20621
CVSS Base Severity: MEDIUM
CVSS Base Score: 6.5
Affected Products
Vendor: Mattermost
Product: Mattermost
Exploit Prediction Scoring System (EPSS)
EPSS Score: 0.04% (probability of being exploited)
EPSS Percentile: 11.64% (scored less or equal to compared to others)
EPSS Date: 2025-02-14 (when was this score calculated)