Mattermost doesn't check public/private permissions

GHSA-m79q-8qf5-v622 · CVE-2026-6343

Published May 18, 2026 · Modified Jun 1, 2026

Description

Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3 fail to check public/private permissions which allows members without these permissions to access public playbooks via /get.. Mattermost Advisory ID: MMSA-2026-00591

References

ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2026-6343
WEB https://github.com/mattermost/mattermost-plugin-playbooks/commit/887d9cacb61655d40f20ad9d6e35b408a127c380
PACKAGE https://github.com/mattermost/mattermost
WEB https://mattermost.com/security-updates

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