VULNERABILITY INTELLIGENCE

CVE-2026-3471

CVSS score6.5 MEDIUM
EPSS probability0.18%
CISA KEVNot currently listed
Published2026-05-18
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Description

Mattermost Desktop App versions <=6.1 6.0.1 5.4.13.0 fail to prevent an invalid URL from loading in a pop-up window in the Mattermost Desktop App which allows a malicious server owner to repeated crash the application via calling {{window.open('javascript:alert()');}}. Mattermost Advisory ID: MMSA-2026-00618

Weakness classification

  • CWE-939: Improper Authorization in Handler for Custom URL Scheme

Primary references