medium6.5
CVE-2026-3471
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 …
Impact
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
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Mattermost | Mattermost Desktop | through 5.4.13.0 from 6.0.0 through 6.0.1 from 6.1.0 before 6.2.0 |