CVE-2026-3471

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CVSS 3.1

6.5 medium

EPSS

<1%p8

Published

May 18, 2026 (May 18, 2026)

Modified

Jun 17, 2026

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

Vendors: mattermost
Products: mattermost desktop
Weakness: CWE-939
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

NVD CVE.org GitHub PoCs EPSS (0.2%)

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