CVE-2026-3471

6.5 MEDIUM

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 Des...

Published: 2026-05-18 · Last updated: 2026-06-05

Severity and scoring

CVSS: 6.5 MEDIUM
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CWE: CWE-939

Affected products

Vendor	Product
mattermost	mattermost_desktop

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

Source: NVD

References

[NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-3471
[Vendor advisory]https://mattermost.com/security-updates

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