CyberRota Analysis
This is a medium severity vulnerability with a CVSS score of 5.4. It affects GitLab. Exploitation may require the attacker to be authenticated.
CVE
CVE-2026-5139
Severity
MEDIUM
CVSS
5.4
EPSS
0.29%
GitLab
Original NVD Description
Mattermost versions 11.7.x <= 11.7.0, 11.6.x <= 11.6.2, 11.5.x <= 11.5.5, 10.11.x <= 10.11.17 fail to enforce administrator authorization on the {{setDefaultInstance}} call within the {{/gitlab connect}} command handler, which allows any authenticated user to overwrite the global default GitLab instance configuration via the {{/gitlab connect <instance-name>}} slash command.. Mattermost Advisory ID: MMSA-2026-00644
Related CVEs
Other vulnerabilities affecting the same vendor(s)