medium4.3
CVE-2025-9078
Mattermost makes Use of Weak Hash
Impact
Mattermost versions 10.8.x <= 10.8.3, 10.5.x <= 10.5.8, 9.11.x <= 9.11.17, 10.10.x <= 10.10.1, 10.9.x <= 10.9.3 fail to properly validate cache keys for link metadata which allows authenticated users to access unauthorized posts and poison link previews via hash collision attacks on FNV-1 hashing.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| go | github.com/mattermost/mattermost-server | >= 10.8.0, < 10.8.4 | 10.8.4 |
| go | github.com/mattermost/mattermost/server/v8 | < 8.0.0-20250718075842-cd87e5c87737 | 8.0.0-20250718075842-cd87e5c87737 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Mattermost | Mattermost Server | from 9.11.0 before 9.11.18 from 10.5.0 before 10.5.9 from 10.8.0 before 10.8.4 from 10.9.0 before 10.9.4 from 10.10.0 before 10.10.2 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://mattermost.com/security-updates
- https://github.com/advisories/GHSA-9p92-x77w-9fw2
- https://nvd.nist.gov/vuln/detail/CVE-2025-9078
- https://github.com/mattermost/mattermost/commit/356880c8430b77a4a390c89d5a33f6928188d137
- https://github.com/mattermost/mattermost/commit/944ad5cdd9876ef61c78c8275906262a4118755a
- https://github.com/mattermost/mattermost/commit/a8a4badc130be101e5bc4b7916bbcd2f966c4b79
- https://github.com/mattermost/mattermost/commit/cd87e5c877373f109742aa90a3fa136c14774325