PT-2026-41650 · Mattermost · Gitlab Plugin

Daw10 · Published 2026-05-18 · Updated 2026-05-18 · CVE-2026-3117

Positive Technologies (AI Summary)

CVSS v3.1

6.5

Medium

Base vector

AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions Mattermost Plugins versions prior to 11.5

Description The Gitlab plugin fails to properly check for permissions when processing commands. This allows standard users to uninstall instances or configure webhook connections by using the "/gitlab instance {option}" and "/gitlab webhook {option}" commands.

Recommendations Update to a version later than 11.5. As a temporary workaround, restrict the use of the "/gitlab instance" and "/gitlab webhook" commands.

Fix

Missing Authorization

Weakness Enumeration

CWE-862

Related Identifiers

CVE-2026-3117

Affected Products

Gitlab Plugin

References · 4

• https://mattermost.com/security-updates · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-3117 · Security Note
• https://twitter.com/CVEarity/status/2056409275032097066 · Twitter Post
• https://t.me/CVEtracker/54111 · Telegram Post