CVE-2026-26304
MEDIUM4.3EPSS 0.04%Mattermost fails to verify run_create permission for empty playbookId
Published: 3/16/2026Modified: 3/23/2026
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
Affected packages (2)
- Go/github.com/mattermost/mattermost-plugin-playbooksfrom 0, < 1.41.1-0.20260316224925-705f54a81841
- Go/github.com/mattermost/mattermost-plugin-playbooksfrom 0, < 1.41.1-0.20260316224925-705f54a81841
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N |
References (5)
- ADVISORYhttps://github.com/advisories/GHSA-4pmx-622h-x359
- ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2026-26304
- PATCHhttps://github.com/mattermost/mattermost-plugin-playbooks
- WEBhttps://github.com/mattermost/mattermost-plugin-playbooks/commit/705f54a818410f3612df3865bfde608ed471037e
- WEBhttps://mattermost.com/security-updates