Vulnerability · Published Sep 19, 2025 · Assigned by Mattermost
CVE-2025-9081IDOR in board file download allows any user to download any file by UUID
Low 3.1
In plain English
A low-severity authorization bypass via user-controlled key in Mattermost from Mattermost. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 20% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)3.1Low
Exploit odds (30 days)0.3%top 80.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
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
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/mattermost/mattermost-plugin-boards | 0.0.0-20250716054606-3f3e3becfe1d | GHSA-f72g-52v7-mg3p |
| Go | github.com/mattermost/mattermost-plugin-boards | 0.0.0-20250716054606-3f3e3becfe1d | GO-2025-3978 |
| Go | github.com/mattermost/mattermost-server | 10.5.9+incompatible, 9.11.18+incompatible | GO-2025-3978 |
| Go | github.com/mattermost/mattermost-server | 9.11.18 | GHSA-f72g-52v7-mg3p |
| Go | github.com/mattermost/mattermost-server | 10.5.9 | GHSA-f72g-52v7-mg3p |
| Go | github.com/mattermost/mattermost-server/v5 | no fix listed | GO-2025-3978 |
| Go | github.com/mattermost/mattermost-server/v6 | no fix listed | GO-2025-3978 |
| Go | github.com/mattermost/mattermost/server/v8 | 8.0.0-20250721095935-11c36f4d1e44 | GHSA-f72g-52v7-mg3p |
| Go | github.com/mattermost/mattermost/server/v8 | 8.0.0-20250721095935-11c36f4d1e44 | GO-2025-3978 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Mattermost | Mattermost | 10.5.0 – through 10.5.89.11.0 – through 9.11.17 |
Weakness: CWE-639 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N