CVE-2026-4643
published 2026-05-18CVE-2026-4643: Mattermost Desktop App versions <=6.1 6.0.1 5.4.13.0 fail to prevent server-rendered content from closing an underlying application view in the Mattermost…
PriorityP415low3.5CVSS 3.1
AVNACLPRLUIRSUCNINAL
EPSS
0.17%
6.7th percentile
Mattermost Desktop App versions <=6.1 6.0.1 5.4.13.0 fail to prevent server-rendered content from closing an underlying application view in the Mattermost Desktop App which allows a malicious server or plugin to crash the desktop client via invoking {{window.close()}} in the renderer context, leading to a denial of service condition at the client level. Mattermost Advisory ID: MMSA-2026-00633
Affected
4 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| mattermost | mattermost | <= 6.0.1 | — |
| mattermost | mattermost_desktop | <= 5.4.13.0 | — |
| mattermost | mattermost_desktop | 6.0.0 – 6.0.1 | — |
| mattermost | mattermost_desktop | >= 6.1.0 < 6.2.0 | 6.2.0 |
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VulDB
Mattermost Desktop App up to 5.4.13/6.0.1/6.1.x window.close unusual condition (EUVD-2026-30758)
vuldb·2026-05-18·CVSS 3.5
CVE-2026-4643 [LOW] Mattermost Desktop App up to 5.4.13/6.0.1/6.1.x window.close unusual condition (EUVD-2026-30758)
A vulnerability, which was classified as problematic, has been found in Mattermost Desktop App up to 5.4.13/6.0.1/6.1.x. Affected by this vulnerability is the function window.close. The manipulation leads to improper check for unusual conditions.
This vulnerability is listed as CVE-2026-4643. The attack may be initiated remotely. There is no available exploit.
It is advisable to upgrade the affected component.
GHSA
GHSA-mf43-g8vp-9q4m: Mattermost Desktop App versions <=6
ghsa_unreviewed·2026-05-18
CVE-2026-4643 [LOW] CWE-754 GHSA-mf43-g8vp-9q4m: Mattermost Desktop App versions <=6
Mattermost Desktop App versions <=6.1 6.0.1 5.4.13.0 fail to prevent server-rendered content from closing an underlying application view in the Mattermost Desktop App which allows a malicious server or plugin to crash the desktop client via invoking {{window.close()}} in the renderer context, leading to a denial of service condition at the client level. Mattermost Advisory ID: MMSA-2026-00633
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
2026-05-18
Published