CVE-2025-9078 json
Weak cache keys lead to post IDOR and link preview poisoning
published 2025-09-15 13 mo ago modified 2026-10-19 20 d ago also GHSA-9p92-x77w-9fw2 , GO-2025-3959 , EUVD-2025-29164
- cvss
- 4.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 4%
- public exploits
- 0
- none known
Summary
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
Patch / fix
- go github.com/mattermost/mattermost-server 9.11.18, 9.11.18+incompatible, 10.5.9, 10.5.9+incompatible, 10.8.4, 10.8.4+incompatible, 10.9.4, 10.9.4+incompatible, 10.10.2, 10.10.2+incompatible
- go github.com/mattermost/mattermost/server/v8 8.0.0-20250718075842-cd87e5c87737
- Mattermost Mattermost 9.11.18, 10.5.9, 10.8.4, 10.9.4, 10.10.2, 10.11.0
- govulncheck-vulndb SLE Module for Package Hub 15 SP6, openSUSE Leap 15.6 0.0.20250918T182144-150000.1.107.1
suse advisories SUSE-SU-2025:03289-1
- govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1
- govulncheck-vulndb openSUSE Tumbleweed 0.0.20250917T170349-1.1
opensuse advisories openSUSE-SU-2026:21483-1openSUSE-SU-2025:15564-1
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 13 mo ago
Exploit prediction
0.15% chance of exploitation in the next 30 days, higher than 4% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N |
| GitHub | 3.1 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| go | github.com/mattermost/mattermost-server | >=10.8.0, <10.8.4 >=10.5.0, <10.5.9 >=9.11.0, <9.11.18 >=10.10.0, <10.10.2 >=10.9.0, <10.9.4 >=9.11.0+incompatible, <9.11.18+incompatible >=10.5.0+incompatible, <10.5.9+incompatible >=10.8.0+incompatible, <10.8.4+incompatible >=10.9.0+incompatible, <10.9.4+incompatible >=10.10.0+incompatible, <10.10.2+incompatible |
10.8.4 10.5.9 9.11.18 10.10.2 10.9.4 9.11.18+incompatible 10.5.9+incompatible 10.8.4+incompatible 10.9.4+incompatible 10.10.2+incompatible |
| go | github.com/mattermost/mattermost/server/v8 | <8.0.0-20250718075842-cd87e5c87737 |
8.0.0-20250718075842-cd87e5c87737 |
| go | github.com/mattermost/mattermost-server/v5 | all versions |
no fix listed |
| go | github.com/mattermost/mattermost-server/v6 | all versions |
no fix listed |
Affected products
- Mattermost Mattermost
Classification
- Weakness
-
- CWE-328 Use of Weak Hash
References
-
github.com
/mattermost/mattermost/commit/356880c8430b77a4a390c89d5a33f6928188d137
web
-
github.com
/mattermost/mattermost/commit/944ad5cdd9876ef61c78c8275906262a4118755a
web
-
github.com
/mattermost/mattermost/commit/a8a4badc130be101e5bc4b7916bbcd2f966c4b79
web
-
github.com
/mattermost/mattermost/commit/cd87e5c877373f109742aa90a3fa136c14774325
web
-
mattermost.com
/security-updates
web, vendor-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2025-9078
advisory
-
github.com
/mattermost/mattermost
package
-
github.com
/advisories/GHSA-9p92-x77w-9fw2
advisory
Sources
- CVE List CVE-2025-9078
- GitHub Advisory GHSA-9p92-x77w-9fw2
- NVD CVE-2025-9078
- OSV GO-2025-3959
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.