CVE-2025-6465
Medium
Description
Mattermost versions 10.8.x <= 10.8.3, 10.5.x <= 10.5.8, 10.10.x <= 10.10.0, 10.9.x <= 10.9.3 fail to sanitize file names which allows users with file upload permission to overwrite file attachment thumbnails via path traversal in file streaming APIs.
SeverityMedium
CVSS4.3
Exploit probability—
Product
Mattermost Server
PublishedAug 21, 2025
First seenAug 21, 2025
Weakness typeCWE-22Path traversal
How to fix
Update
- mattermost mattermost_server10.5.9, 10.8.4, 10.9.4 or later
- github.com/mattermost/mattermost-server10.8.4, 10.5.9, 10.9.4, 10.10.1, 10.5.9+incompatible, 10.8.4+incompatible, 10.9.4+incompatible, 10.10.1+incompatible or later
- github.com/mattermost/mattermost/server/v88.0.0-20250708173752-d6b35c41f0ae5 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mattermost mattermost_server | 10.5.0 ≤ v < 10.5.9, 10.8.0 ≤ v < 10.8.4, 10.9.0 ≤ v < 10.9.4, 10.10.0 | 10.5.9, 10.8.4, 10.9.4 |
| github.com/mattermost/mattermost-serverGo | 10.8.0 ≤ v < 10.8.4, 10.5.0 ≤ v < 10.5.9, 10.9.0 ≤ v < 10.9.4, 10.10.0 ≤ v < 10.10.1, 10.5.0+incompatible ≤ v < 10.5.9+incompatible, 10.8.0+incompatible ≤ v < 10.8.4+incompatible, 10.9.0+incompatible ≤ v < 10.9.4+incompatible, 10.10.0+incompatible ≤ v < 10.10.1+incompatible | 10.8.4, 10.5.9, 10.9.4, 10.10.1, 10.5.9+incompatible, 10.8.4+incompatible, 10.9.4+incompatible, 10.10.1+incompatible |
| github.com/mattermost/mattermost/server/v8Go | v < 8.0.0-20250708173752-d6b35c41f0ae5, No range specified | 8.0.0-20250708173752-d6b35c41f0ae5 |
| github.com/mattermost/mattermost-server/v5Go | No range specified | — |
| github.com/mattermost/mattermost-server/v6Go | No range specified | — |
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