Improper Access Control in Mattermost allows System Managers to view team details despite role restrictions
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 · NVD. Fix status from CNA and GitHub. Impact type from CWE-863.
Summary
Mattermost versions 10.7.x <= 10.7.0, 10.5.x <= 10.5.3, 9.11.x <= 9.11.12 fails to properly enforce access control restrictions for System Manager roles, allowing authenticated users with System Manager privileges to view team details they should not have access to via direct API requests to team endpoints, even when explicitly configured with 'No access' to Teams in the System Console.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00234 14th percentileScored 2026-11-07
Fix Fixed Mattermost (Mattermost): 10.8.0, 10.7.1, 10.5.4 +1github.com/mattermost/mattermost/server/v8 (Go): 10.7.1, 10.5.4, 9.11.13 +1
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 | 10.7.0; 10.5.0 – 10.5.3; 9.11.0 – 9.11.12 | 10.8.0, 10.7.1, 10.5.4, 9.11.13 | Patch available | CNA |
| — | github.com/mattermost/mattermost/server/v8 (Go) | 10.6.0-rc1 to before 10.7.1 | 10.7.1 | Patch available | GHSA-86jg-35xj-3vv5 |
| — | github.com/mattermost/mattermost/server/v8 (Go) | 10.0.0-rc1 to before 10.5.4 | 10.5.4 | Patch available | GHSA-86jg-35xj-3vv5 |
| — | github.com/mattermost/mattermost/server/v8 (Go) | 9.0.0-rc1 to before 9.11.13 | 9.11.13 | Patch available | GHSA-86jg-35xj-3vv5 |
| — | github.com/mattermost/mattermost/server/v8 (Go) | before 8.0.0-20250414154356-6f33b721de76 | 8.0.0-20250414154356-6f33b721de76 | Patch available | GHSA-86jg-35xj-3vv5 |
- Mattermost VendorMattermost Affected 10.7.0; 10.5.0 – 10.5.3; 9.11.0 – 9.11.12 Fixed in 10.8.0, 10.7.1, 10.5.4, 9.11.13 Patch available CNA
- github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected 10.6.0-rc1 to before 10.7.1 Fixed in 10.7.1 Patch available GHSA-86jg-35xj-3vv5
- github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected 10.0.0-rc1 to before 10.5.4 Fixed in 10.5.4 Patch available GHSA-86jg-35xj-3vv5
- github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected 9.0.0-rc1 to before 9.11.13 Fixed in 9.11.13 Patch available GHSA-86jg-35xj-3vv5
- github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected before 8.0.0-20250414154356-6f33b721de76 Fixed in 8.0.0-20250414154356-6f33b721de76 Patch available GHSA-86jg-35xj-3vv5
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* | 9.11.0 to before 9.11.13; 10.5.0 to before 10.5.4 | Vulnerable | Mattermost |
| cpe:2.3:a:mattermost:mattermost_server:10.7.0:-:*:*:*:*:*:* | 10.7.0 | Vulnerable | Mattermost |
| cpe:2.3:a:mattermost:mattermost_server:10.7.0:rc1:*:*:*:*:*:* | 10.7.0 rc1 | Vulnerable | Mattermost |
| cpe:2.3:a:mattermost:mattermost_server:10.7.0:rc2:*:*:*:*:*:* | 10.7.0 rc2 | Vulnerable | Mattermost |
- cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* Versions 9.11.0 to before 9.11.13; 10.5.0 to before 10.5.4 Vulnerable ·Mattermost
- cpe:2.3:a:mattermost:mattermost_server:10.7.0:-:*:*:*:*:*:* Versions 10.7.0 Vulnerable ·Mattermost
- cpe:2.3:a:mattermost:mattermost_server:10.7.0:rc1:*:*:*:*:*:* Versions 10.7.0 rc1 Vulnerable ·Mattermost
- cpe:2.3:a:mattermost:mattermost_server:10.7.0:rc2:*:*:*:*:*:* Versions 10.7.0 rc2 Vulnerable ·Mattermost
Remediation
- Fix · CNA Mattermost (Mattermost) Fixed in 10.8.0, 10.7.1, 10.5.4, 9.11.13
- Fix · GHSA-86jg-35xj-3vv5 github.com/mattermost/mattermost/server/v8 (Go) Fixed in 10.7.1 Advisory →
- Fix · GHSA-86jg-35xj-3vv5 github.com/mattermost/mattermost/server/v8 (Go) Fixed in 10.5.4 Advisory →
- Fix · GHSA-86jg-35xj-3vv5 github.com/mattermost/mattermost/server/v8 (Go) Fixed in 9.11.13 Advisory →
- Fix · GHSA-86jg-35xj-3vv5 github.com/mattermost/mattermost/server/v8 (Go) Fixed in 8.0.0-20250414154356-6f33b721de76 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2025-3611
- 2026-10-03 Alias added: GHSA-86jg-35xj-3vv5
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-2025-3611 · CVE Program
- CVE-2025-3611 · NVD
- FIRST EPSS
- GHSA-86jg-35xj-3vv5 · GitHub Advisory Database · CC BY 4.0
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