Vulnerability · Published Aug 21, 2025 · Assigned by Mattermost
CVE-2025-8023Path Traversal in Template Upload Allows Uploading Files Outside Target Directory
Medium 6.8
In plain English
A medium-severity path traversal 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 0.4% (higher than 35% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Mattermost versions 10.8.x <= 10.8.3, 10.5.x <= 10.5.8, 9.11.x <= 9.11.17, 10.9.x <= 10.9.2 fails to sanitize path traversal sequences in template file destination paths, which allows a system admin to perform path traversal attacks via malicious path components, potentially enabling malicious file placement outside intended directories.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/mattermost/mattermost-server | 10.5.9+incompatible, 10.8.4+incompatible, 10.9.3+incompatible, 9.11.18+incompatible | GO-2025-3907 |
| Go | github.com/mattermost/mattermost-server | 10.8.4 | GHSA-x67c-v8jr-p29r |
| Go | github.com/mattermost/mattermost-server | 10.5.9 | GHSA-x67c-v8jr-p29r |
| Go | github.com/mattermost/mattermost-server | 9.11.18 | GHSA-x67c-v8jr-p29r |
| Go | github.com/mattermost/mattermost-server | 10.9.3 | GHSA-x67c-v8jr-p29r |
| Go | github.com/mattermost/mattermost-server/v5 | no fix listed | GHSA-x67c-v8jr-p29r |
| Go | github.com/mattermost/mattermost-server/v5 | no fix listed | GO-2025-3907 |
| Go | github.com/mattermost/mattermost-server/v6 | no fix listed | GO-2025-3907 |
| Go | github.com/mattermost/mattermost-server/v6 | no fix listed | GHSA-x67c-v8jr-p29r |
| Go | github.com/mattermost/mattermost/server/v8 | 8.0.0-20250708065844-b38e2eccda18 | GHSA-x67c-v8jr-p29r |
| Go | github.com/mattermost/mattermost/server/v8 | 8.0.0-20250708065844-b38e2eccda18 | GO-2025-3907 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Mattermost | Mattermost | 10.8.0 – through 10.8.310.5.0 – through 10.5.89.11.0 – through 9.11.1710.9.0 – through 10.9.2 |
Weakness: CWE-22 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N