IDOR in board file download allows any user to download any file by UUID
Priority LOW 29CWE-639Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-639.
Summary
Mattermost versions 10.5.x <= 10.5.8, 9.11.x <= 9.11.17 fail to properly validate access controls which allows any authenticated user to download sensitive files via board file download endpoint using UUID enumeration
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00275 19th percentileScored 2026-11-07
Fix Fixed Mattermost (Mattermost): 10.11.0, 10.5.9, 9.11.18github.com/mattermost/mattermost-plugin-boards (Go): 0.0.0-20250716054606-3f3e3becfe1d+2 more products
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 – 10.5.8; 9.11.0 – 9.11.17 | 10.11.0, 10.5.9, 9.11.18 | Patch available | CNA |
| — | github.com/mattermost/mattermost-plugin-boards (Go) | before 0.0.0-20250716054606-3f3e3becfe1d | 0.0.0-20250716054606-3f3e3becfe1d | Patch available | GHSA-f72g-52v7-mg3p |
| — | github.com/mattermost/mattermost/server/v8 (Go) | before 8.0.0-20250721095935-11c36f4d1e44 | 8.0.0-20250721095935-11c36f4d1e44 | Patch available | GHSA-f72g-52v7-mg3p |
| — | github.com/mattermost/mattermost-server (Go) | 10.5.0-rc1 to before 10.5.9 | 10.5.9 | Patch available | GHSA-f72g-52v7-mg3p |
| — | github.com/mattermost/mattermost-server (Go) | 9.11.0-rc1 to before 9.11.18 | 9.11.18 | Patch available | GHSA-f72g-52v7-mg3p |
- Mattermost VendorMattermost Affected 10.5.0 – 10.5.8; 9.11.0 – 9.11.17 Fixed in 10.11.0, 10.5.9, 9.11.18 Patch available CNA
- github.com/mattermost/mattermost-plugin-boards (Go) Vendor— Affected before 0.0.0-20250716054606-3f3e3becfe1d Fixed in 0.0.0-20250716054606-3f3e3becfe1d Patch available GHSA-f72g-52v7-mg3p
- github.com/mattermost/mattermost/server/v8 (Go) Vendor— Affected before 8.0.0-20250721095935-11c36f4d1e44 Fixed in 8.0.0-20250721095935-11c36f4d1e44 Patch available GHSA-f72g-52v7-mg3p
- github.com/mattermost/mattermost-server (Go) Vendor— Affected 10.5.0-rc1 to before 10.5.9 Fixed in 10.5.9 Patch available GHSA-f72g-52v7-mg3p
- github.com/mattermost/mattermost-server (Go) Vendor— Affected 9.11.0-rc1 to before 9.11.18 Fixed in 9.11.18 Patch available GHSA-f72g-52v7-mg3p
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* | 9.11.0 to before 9.11.17; 10.5.0 to before 10.5.9 | Vulnerable | Mattermost |
- cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* Versions 9.11.0 to before 9.11.17; 10.5.0 to before 10.5.9 Vulnerable ·Mattermost
Remediation
- Fix · CNA Mattermost (Mattermost) Fixed in 10.11.0, 10.5.9, 9.11.18
- Fix · GHSA-f72g-52v7-mg3p github.com/mattermost/mattermost-plugin-boards (Go) Fixed in 0.0.0-20250716054606-3f3e3becfe1d Advisory →
- Fix · GHSA-f72g-52v7-mg3p github.com/mattermost/mattermost/server/v8 (Go) Fixed in 8.0.0-20250721095935-11c36f4d1e44 Advisory →
- Fix · GHSA-f72g-52v7-mg3p github.com/mattermost/mattermost-server (Go) Fixed in 10.5.9 Advisory →
- Fix · GHSA-f72g-52v7-mg3p github.com/mattermost/mattermost-server (Go) Fixed in 9.11.18 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2025-9081
- 2026-10-03 Alias added: GHSA-f72g-52v7-mg3p
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-2025-9081 · CVE Program
- CVE-2025-9081 · NVD
- FIRST EPSS
- GHSA-f72g-52v7-mg3p · 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