CVE-2025-55035

Mattermost Desktop DoS when user has basic authentication server configured

State: Published
Severity: 6.1 Medium
Published: Oct 16, 2025
Updated: Oct 16, 2025
Reserved: Sep 11, 2025

Description

Mattermost Desktop App versions <=5.13.0 fail to manage modals in the Mattermost Desktop App that stops a user with a server that uses basic authentication from accessing their server which allows an attacker that provides a malicious server to the user to deny use of the Desktop App via having the user configure the malicious server and forcing a modal popup that cannot be closed.

Scores

CVSS	Score	Vector	Source
3.1	6.1 Medium	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:N/I:N/A:H	Mattermost

Weaknesses

CWE-754 Improper Check for Unusual or Exceptional Conditions

Affected Products

Product	Versions
MattermostMattermost	5.0.13 and earlierAffected 5.13.1.0Not affected

References

https://mattermost.com/security-updates

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