CVE-2025-55035 MEDIUM

CVE-2025-55035: Mattermost Desktop DoS when user has basic authentication server configured

Vendor Mattermost
Product Mattermost
Weakness CWE-754
Published October 16, 2025
Last update October 16, 2025
View on NVD All CVEs

CVSS base score

6.1/10
Attack vector Network
Attack complexity High
Privileges required None
User interaction Required
Confidentiality None
Integrity None

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

October 16, 2025 CVE published
October 16, 2025 Record updated