PT-2026-41651 · Mattermost · Mattermost Desktop App

Game0V3R · Published 2026-05-18 · Updated 2026-05-18 · CVE-2026-3471

Positive Technologies (AI Summary)

CVSS v3.1

6.5

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions Mattermost Desktop App versions prior to 6.1

Description The application fails to prevent invalid URLs from loading in pop-up windows. This allows a malicious server owner to repeatedly crash the application by calling the window.open('javascript:alert()') function.

Recommendations Update to a version later than 6.1.

Fix

Weakness Enumeration

CWE-939

Related Identifiers

CVE-2026-3471

Affected Products

Mattermost Desktop App

References · 4

• https://mattermost.com/security-updates · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-3471 · Security Note
• https://twitter.com/CVEarity/status/2056409354300281106 · Twitter Post
• https://t.me/CVEtracker/54112 · Telegram Post