Unauthorized channel member management through playbook runs
Priority LOW 20CWE-863Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- Low · None · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-863.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00246 15th percentileScored 2026-11-07
Fix Fixed Mattermost (Mattermost): 10.9.0, 10.5.6, 9.11.16 +3github.com/mattermost/mattermost-server (Go): 0.0.0-20250520060012-d0380305ef7a+1 more product
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Mattermost | Mattermost | 10.5.0 – 10.5.5; 9.11.0 – 9.11.15; 10.8.0; 10.7.0 – 10.7.2; 10.6.0 – 10.6.5 | 10.9.0, 10.5.6, 9.11.16, 10.8.1, 10.7.3, 10.6.6 | Patch available | CNA |
| — | github.com/mattermost/mattermost-server (Go) | before 0.0.0-20250520060012-d0380305ef7a | 0.0.0-20250520060012-d0380305ef7a | Patch available | GHSA-qwwm-c582-82rx |
| — | github.com/mattermost/mattermost/server/v8 (Go) | before 8.0.0-20250520060012-d0380305ef7a | 8.0.0-20250520060012-d0380305ef7a | Patch available | GHSA-qwwm-c582-82rx |
| — | github.com/mattermost/mattermost/server/v8 (Go) | 10.5.0 to before 10.5.6 | 10.5.6 | Patch available | GHSA-qwwm-c582-82rx |
| — | github.com/mattermost/mattermost/server/v8 (Go) | 9.11.0 to before 9.11.16 | 9.11.16 | Patch available | GHSA-qwwm-c582-82rx |
| — | github.com/mattermost/mattermost/server/v8 (Go) | 10.8.0 to before 10.8.1 | 10.8.1 | Patch available | GHSA-qwwm-c582-82rx |
| — | github.com/mattermost/mattermost/server/v8 (Go) | 10.7.0 to before 10.7.3 | 10.7.3 | Patch available | GHSA-qwwm-c582-82rx |
| — | github.com/mattermost/mattermost/server/v8 (Go) | 10.6.0 to before 10.6.6 | 10.6.6 | Patch available | GHSA-qwwm-c582-82rx |
- Mattermost VendorMattermost Affected 10.5.0 – 10.5.5; 9.11.0 – 9.11.15; 10.8.0; 10.7.0 – 10.7.2; 10.6.0 – 10.6.5 Fixed in 10.9.0, 10.5.6, 9.11.16, 10.8.1, 10.7.3, 10.6.6 Patch available CNA
- github.com/mattermost/mattermost-server (Go) Vendor— Affected before 0.0.0-20250520060012-d0380305ef7a Fixed in 0.0.0-20250520060012-d0380305ef7a Patch available GHSA-qwwm-c582-82rx
- github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected before 8.0.0-20250520060012-d0380305ef7a Fixed in 8.0.0-20250520060012-d0380305ef7a Patch available GHSA-qwwm-c582-82rx
- github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected 10.5.0 to before 10.5.6 Fixed in 10.5.6 Patch available GHSA-qwwm-c582-82rx
- github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected 9.11.0 to before 9.11.16 Fixed in 9.11.16 Patch available GHSA-qwwm-c582-82rx
- github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected 10.8.0 to before 10.8.1 Fixed in 10.8.1 Patch available GHSA-qwwm-c582-82rx
- github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected 10.7.0 to before 10.7.3 Fixed in 10.7.3 Patch available GHSA-qwwm-c582-82rx
- github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected 10.6.0 to before 10.6.6 Fixed in 10.6.6 Patch available GHSA-qwwm-c582-82rx
CPE configurations NVD · 5
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* | 9.11.0 to before 9.11.16; 10.5.0 to before 10.5.6; 10.6.0 to before 10.6.6; 10.7.0 to before 10.7.3 | Vulnerable | Mattermost |
| cpe:2.3:a:mattermost:mattermost_server:10.8.0:-:*:*:*:*:*:* | 10.8.0 | Vulnerable | Mattermost |
| cpe:2.3:a:mattermost:mattermost_server:10.8.0:rc1:*:*:*:*:*:* | 10.8.0 rc1 | Vulnerable | Mattermost |
| cpe:2.3:a:mattermost:mattermost_server:10.8.0:rc2:*:*:*:*:*:* | 10.8.0 rc2 | Vulnerable | Mattermost |
| cpe:2.3:a:mattermost:mattermost_server:10.8.0:rc3:*:*:*:*:*:* | 10.8.0 rc3 | Vulnerable | Mattermost |
- cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* Versions 9.11.0 to before 9.11.16; 10.5.0 to before 10.5.6; 10.6.0 to before 10.6.6; 10.7.0 to before 10.7.3 Vulnerable ·Mattermost
- cpe:2.3:a:mattermost:mattermost_server:10.8.0:-:*:*:*:*:*:* Versions 10.8.0 Vulnerable ·Mattermost
- cpe:2.3:a:mattermost:mattermost_server:10.8.0:rc1:*:*:*:*:*:* Versions 10.8.0 rc1 Vulnerable ·Mattermost
- cpe:2.3:a:mattermost:mattermost_server:10.8.0:rc2:*:*:*:*:*:* Versions 10.8.0 rc2 Vulnerable ·Mattermost
- cpe:2.3:a:mattermost:mattermost_server:10.8.0:rc3:*:*:*:*:*:* Versions 10.8.0 rc3 Vulnerable ·Mattermost
Remediation
- Fix · CNA Mattermost (Mattermost) Fixed in 10.9.0, 10.5.6, 9.11.16, 10.8.1, 10.7.3, 10.6.6
- Fix · GHSA-qwwm-c582-82rx github.com/mattermost/mattermost-server (Go) Fixed in 0.0.0-20250520060012-d0380305ef7a Advisory →
- Fix · GHSA-qwwm-c582-82rx github.com/mattermost/mattermost/server/v8 (Go) Fixed in 8.0.0-20250520060012-d0380305ef7a Advisory →
- Fix · GHSA-qwwm-c582-82rx github.com/mattermost/mattermost/server/v8 (Go) Fixed in 10.5.6 Advisory →
- Fix · GHSA-qwwm-c582-82rx github.com/mattermost/mattermost/server/v8 (Go) Fixed in 9.11.16 Advisory →
- Fix · GHSA-qwwm-c582-82rx github.com/mattermost/mattermost/server/v8 (Go) Fixed in 10.8.1 Advisory →
- Fix · GHSA-qwwm-c582-82rx github.com/mattermost/mattermost/server/v8 (Go) Fixed in 10.7.3 Advisory →
- Fix · GHSA-qwwm-c582-82rx github.com/mattermost/mattermost/server/v8 (Go) Fixed in 10.6.6 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2025-3227
- 2026-10-03 Alias added: GHSA-qwwm-c582-82rx
References
More Mattermost Server vulnerabilities
- TI-2025-18933 Arbitrary file read in Mattermost Boards via import & export board archive CVSS 3.1CRITICAL 9.9
- TI-2025-04465 Path Traversal Leading to RCE by Any Authenticated Mattermost User CVSS 3.1CRITICAL 9.9
- TI-2017-14068 An issue was discovered in Mattermost Server before 3.6.2. CVSS 3.1CRITICAL 9.8
- TI-2017-14060 An issue was discovered in Mattermost Server before 3.8.2, 3.7.5, and 3.6.7. CVSS 3.1CRITICAL 9.8
- TI-2017-14048 An issue was discovered in Mattermost Server before 4.1.0, 4.0.4, and 3.10.3. CVSS 3.1CRITICAL 9.8
- TI-2025-14360 Arbitrary file read via block duplication in Mattermost Boards CVSS 3.1CRITICAL 9.9
Sources
- CVE-2025-3227 · CVE Program
- CVE-2025-3227 · NVD
- FIRST EPSS
- GHSA-qwwm-c582-82rx · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences