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CVE-2026-4643

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Summary

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

CVSS Score
3.5
Low
EPSS Score
0.0
Exploit Probability
Published Date
2026-05-18
First Seen: 2026-05-19
📊 Relative Risk Intelligence

This CVE is Lower Risk - more severe than 3.9% of all 325,703 vulnerabilities in our database.

#313,008
Below average severity
Severity Percentile
đŸŽ¯ CISA SSVC Assessment Updated: May 18, 2026
🔍 Exploitation Status
None
No known exploits
⚙ī¸ Automatable
NO
Requires human interaction
đŸ’Ĩ Technical Impact
Partial
Limited system impact
🏆 Discovered By
Devin Binnie
SSVC data provided by CISA
Last Modified 2026-06-05
Source NVD 🔗
CVSS Vector 3.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:L
CWE IDs (Weakness Types)
CWE-754

đŸ“Ļ Affected Products 3

Vendor Product Status Affected Versions
mattermost mattermost_desktop Affected
< 5.4.13.0
mattermost mattermost_desktop Affected
> 6.0.0 < 6.0.1
mattermost mattermost_desktop Affected
> 6.1.0 < 6.2.0

🔗 References 1

https://mattermost.com/security-updates
Vendor Advisory

🔗 Related CVEs 6

CVE ID Severity CVSS EPSS Summary Published
CVE-2026-3471 đŸ”ļ medium 6.5 0.0 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 t... 2026-05-18
CVE-2026-1628 đŸ”ļ medium 4.6 0.0 Mattermost Desktop App versions <=5.13.3 fail to attach listeners restricting navigation to external sites within the Ma... 2026-03-02
CVE-2026-1046 ⚠ī¸ high 7.6 0.0 Mattermost Desktop App versions <=6.0 6.2.0 5.2.13.0 fail to validate help links which allows a malicious Mattermost ser... 2026-02-16
CVE-2025-13321 ℹī¸ low 3.3 0.0 Mattermost Desktop App versions <6.0.0 fail to sanitize sensitive information from Mattermost logs and clear data on ser... 2025-12-17
CVE-2025-13326 ℹī¸ low 3.9 0.0 Mattermost Desktop App versions <6.0.0 fail to enable the Hardened Runtime on the Mattermost Desktop App when packaged f... 2025-12-17
CVE-2025-55035 đŸ”ļ medium 6.1 0.1 Mattermost Desktop App versions <=5.13.0 fail to manage modals in the Mattermost Desktop App that stops a user with a se... 2025-10-16
These CVEs affect the same products