# CVE-2025-3227: Unauthorized channel member management through playbook runs

> CVE-2025-3227: Unauthorized channel member management through playbook runs. CVSS 4.3 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2025-3227
Last updated: 2026-06-17T09:19:28Z

- Published: 2025-06-20 14:31 UTC · Updated: 2026-06-17 09:19 UTC · Assigner: Mattermost
- CVSS: 4.3 (CVSS 3.1) · Severity: Medium · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
- EPSS: 0.25%, 16th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-863

## Description

Mattermost versions 10.5.x \<= 10.5.5, 9.11.x \<= 9.11.15, 10.8.x \<= 10.8.0, 10.7.x \<= 10.7.2, 10.6.x \<= 10.6.5 fail to properly enforce channel member management permissions in playbook runs, allowing authenticated users without the 'Manage Channel Members' permission to add or remove users from public and private channels by manipulating playbook run participants when the run is linked to a channel.

## Affected vendors and products

- Mattermost: Mattermost

## Tracked companies

- [Mattermost](https://rewindex.com/company/mattermost.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2025-3227)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2025-3227)
- [https://mattermost.com/security-updates](https://mattermost.com/security-updates)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2025-3227 · Markdown: https://rewindex.com/cve/CVE-2025-3227.md · JSON: https://rewindex.com/api/v1/cves/CVE-2025-3227 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:10:54.089Z