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Vulnerable Software

Vulnerability Details CVE-2026-8683

Mattermost Desktop App versions <=6.1 5.5.13.0 fail to account for attempting to open extremely long URLs in the Mattermost Desktop App which allows a malicious server owner to crash the application via including a script to call window.open on a very large URL. Mattermost Advisory ID: MMSA-2026-00652

Exploit prediction scoring system (EPSS) score

EPSS Score 0.002

EPSS Ranking 9.8%

CVSS Severity

CVSS v3 Score 6.5

References

https://mattermost.com/security-updates

Products affected by CVE-2026-8683

Mattermost » Mattermost Desktop » Version: 1.3.0

cpe:2.3:a:mattermost:mattermost_desktop:1.3.0
Mattermost » Mattermost Desktop » Version: 4.2.2

cpe:2.3:a:mattermost:mattermost_desktop:4.2.2
Mattermost » Mattermost Desktop » Version: 4.2.3

cpe:2.3:a:mattermost:mattermost_desktop:4.2.3
Mattermost » Mattermost Desktop » Version: 4.3.0

cpe:2.3:a:mattermost:mattermost_desktop:4.3.0
Mattermost » Mattermost Desktop » Version: 4.3.2

cpe:2.3:a:mattermost:mattermost_desktop:4.3.2
Mattermost » Mattermost Desktop » Version: 4.4.0

cpe:2.3:a:mattermost:mattermost_desktop:4.4.0
Mattermost » Mattermost Desktop » Version: 4.4.1

cpe:2.3:a:mattermost:mattermost_desktop:4.4.1
Mattermost » Mattermost Desktop » Version: 4.4.2

cpe:2.3:a:mattermost:mattermost_desktop:4.4.2
Mattermost » Mattermost Desktop » Version: 4.5.0

cpe:2.3:a:mattermost:mattermost_desktop:4.5.0
Mattermost » Mattermost Desktop » Version: 4.5.1

cpe:2.3:a:mattermost:mattermost_desktop:4.5.1
Mattermost » Mattermost Desktop » Version: 4.5.2

cpe:2.3:a:mattermost:mattermost_desktop:4.5.2
Mattermost » Mattermost Desktop » Version: 4.5.3

cpe:2.3:a:mattermost:mattermost_desktop:4.5.3
Mattermost » Mattermost Desktop » Version: 4.5.4

cpe:2.3:a:mattermost:mattermost_desktop:4.5.4
Mattermost » Mattermost Desktop » Version: 4.6.0

cpe:2.3:a:mattermost:mattermost_desktop:4.6.0
Mattermost » Mattermost Desktop » Version: 4.6.1

cpe:2.3:a:mattermost:mattermost_desktop:4.6.1
Mattermost » Mattermost Desktop » Version: 4.6.2

cpe:2.3:a:mattermost:mattermost_desktop:4.6.2
Mattermost » Mattermost Desktop » Version: 4.7.0

cpe:2.3:a:mattermost:mattermost_desktop:4.7.0
Mattermost » Mattermost Desktop » Version: 4.7.1

cpe:2.3:a:mattermost:mattermost_desktop:4.7.1
Mattermost » Mattermost Desktop » Version: 4.7.2

cpe:2.3:a:mattermost:mattermost_desktop:4.7.2
Mattermost » Mattermost Desktop » Version: 5.0.0

cpe:2.3:a:mattermost:mattermost_desktop:5.0.0
Mattermost » Mattermost Desktop » Version: 5.0.1

cpe:2.3:a:mattermost:mattermost_desktop:5.0.1
Mattermost » Mattermost Desktop » Version: 5.0.2

cpe:2.3:a:mattermost:mattermost_desktop:5.0.2
Mattermost » Mattermost Desktop » Version: 5.0.3

cpe:2.3:a:mattermost:mattermost_desktop:5.0.3
Mattermost » Mattermost Desktop » Version: 5.0.4

cpe:2.3:a:mattermost:mattermost_desktop:5.0.4
Mattermost » Mattermost Desktop » Version: 5.1.0

cpe:2.3:a:mattermost:mattermost_desktop:5.1.0
Mattermost » Mattermost Desktop » Version: 5.1.1

cpe:2.3:a:mattermost:mattermost_desktop:5.1.1
Mattermost » Mattermost Desktop » Version: 5.10.0

cpe:2.3:a:mattermost:mattermost_desktop:5.10.0
Mattermost » Mattermost Desktop » Version: 5.10.1

cpe:2.3:a:mattermost:mattermost_desktop:5.10.1
Mattermost » Mattermost Desktop » Version: 5.10.2

cpe:2.3:a:mattermost:mattermost_desktop:5.10.2
Mattermost » Mattermost Desktop » Version: 5.11.0

cpe:2.3:a:mattermost:mattermost_desktop:5.11.0
Mattermost » Mattermost Desktop » Version: 5.11.1

cpe:2.3:a:mattermost:mattermost_desktop:5.11.1
Mattermost » Mattermost Desktop » Version: 5.11.2

cpe:2.3:a:mattermost:mattermost_desktop:5.11.2
Mattermost » Mattermost Desktop » Version: 5.11.3

cpe:2.3:a:mattermost:mattermost_desktop:5.11.3
Mattermost » Mattermost Desktop » Version: 5.12.0

cpe:2.3:a:mattermost:mattermost_desktop:5.12.0
Mattermost » Mattermost Desktop » Version: 5.12.1

cpe:2.3:a:mattermost:mattermost_desktop:5.12.1
Mattermost » Mattermost Desktop » Version: 5.13.0

cpe:2.3:a:mattermost:mattermost_desktop:5.13.0
Mattermost » Mattermost Desktop » Version: 5.2.0

cpe:2.3:a:mattermost:mattermost_desktop:5.2.0
Mattermost » Mattermost Desktop » Version: 5.2.1

cpe:2.3:a:mattermost:mattermost_desktop:5.2.1
Mattermost » Mattermost Desktop » Version: 5.2.2

cpe:2.3:a:mattermost:mattermost_desktop:5.2.2
Mattermost » Mattermost Desktop » Version: 5.3.1

cpe:2.3:a:mattermost:mattermost_desktop:5.3.1
Mattermost » Mattermost Desktop » Version: 5.4.0

cpe:2.3:a:mattermost:mattermost_desktop:5.4.0
Mattermost » Mattermost Desktop » Version: 5.5.0

cpe:2.3:a:mattermost:mattermost_desktop:5.5.0
Mattermost » Mattermost Desktop » Version: 5.5.1

cpe:2.3:a:mattermost:mattermost_desktop:5.5.1
Mattermost » Mattermost Desktop » Version: 5.6.0

cpe:2.3:a:mattermost:mattermost_desktop:5.6.0
Mattermost » Mattermost Desktop » Version: 5.7.0

cpe:2.3:a:mattermost:mattermost_desktop:5.7.0
Mattermost » Mattermost Desktop » Version: 5.8.0

cpe:2.3:a:mattermost:mattermost_desktop:5.8.0
Mattermost » Mattermost Desktop » Version: 5.8.1

cpe:2.3:a:mattermost:mattermost_desktop:5.8.1
Mattermost » Mattermost Desktop » Version: 5.9.0

cpe:2.3:a:mattermost:mattermost_desktop:5.9.0
Mattermost » Mattermost Desktop » Version: 5.9.1

cpe:2.3:a:mattermost:mattermost_desktop:5.9.1
Mattermost » Mattermost Desktop » Version: 5.9.2

cpe:2.3:a:mattermost:mattermost_desktop:5.9.2
Mattermost » Mattermost Desktop » Version: 6.1.0

cpe:2.3:a:mattermost:mattermost_desktop:6.1.0

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Vulnerability Details CVE-2026-8683

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