MEDIUMCVSS 5.4EPSS 0.3%
CVE-2026-5139
Mattermost doesn't enforce administrator authorization on the {{setDefaultInstance}} call within the {{/gitlab connect}} command handler
Summary
Mattermost versions 11.7.x }} slash command.. Mattermost Advisory ID: MMSA-2026-00644
Affected packages
| Ecosystem | Package | Affected versions | Fixed versions |
|---|---|---|---|
| Go | github.com/mattermost/mattermost-server | — | 11.7.1, 11.6.3, 11.5.6, 10.11.18 |
Remediation: Upgrade to 11.7.1 or later.
References
Includes data from the GitHub Advisory Database, licensed under CC-BY 4.0.
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EPSS scores provided by the FIRST.org Exploit Prediction Scoring System.