Vulnerability Details CVE-2026-3117
Mattermost Plugins versions <=11.5 11.1.5 10.13.11 11.3.4.0 fail to properly check for permissions when processing commands in the Gitlab plugin which allows normal users to uninstall instances or setup webhook connections via the {{gitlab instance {option}}} or the {{/gitlab webhook {option}}} commands. Mattermost Advisory ID: MMSA-2026-00600
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 10.8%
CVSS Severity
CVSS v3 Score 6.5
References
Products affected by CVE-2026-3117
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cpe:2.3:a:mattermost:mattermost_server:*
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cpe:2.3:a:mattermost:mattermost_server:11.1.0
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cpe:2.3:a:mattermost:mattermost_server:11.1.1
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cpe:2.3:a:mattermost:mattermost_server:11.1.2
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cpe:2.3:a:mattermost:mattermost_server:11.1.3
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cpe:2.3:a:mattermost:mattermost_server:11.3.0
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cpe:2.3:a:mattermost:mattermost_server:11.3.1
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cpe:2.3:a:mattermost:mattermost_server:11.3.2
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cpe:2.3:a:mattermost:mattermost_server:11.3.3