Mattermost fails to verify run_create permission for empty playbookId

GHSA-4pmx-622h-x359 · CVE-2026-26304 · GO-2026-4812

Published Mar 16, 2026 · Modified Mar 23, 2026

Description

Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2 fail to verify run_create permission for empty playbookId, which allows team members to create unauthorized runs via the playbook run API. Mattermost Advisory ID: MMSA-2025-00542

References

ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2026-26304
WEB https://github.com/mattermost/mattermost-plugin-playbooks/commit/705f54a818410f3612df3865bfde608ed471037e
PACKAGE https://github.com/mattermost/mattermost-plugin-playbooks
WEB https://mattermost.com/security-updates

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