CVE-2025-9078 — Use of Weak Hash in Mattermost Mattermost-server

CWE-328 — Use of Weak Hash5 documents4 sources
Severity
4.3MEDIUMNVD
EPSS
0.0%
top 93.90%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
4
Github.com Mattermost Mattermost-serverGithub.com Mattermost Mattermost Server V8Mattermost Server+1 more
Timeline
PublishedSep 15
Latest updateSep 17

Description

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

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:NExploitability: 2.8 | Impact: 1.4

Affected Packages4 packages

▶NVDmattermost/mattermost_server9.11.0 — 9.11.18+4
▶Gogithub.com/mattermost_mattermost_server_v8< 8.0.0-20250718075842-cd87e5c87737
▶CVEListV5mattermost/mattermost10.8.0 — 10.8.3+4

🔴Vulnerability Details

4
OSV
Mattermost makes Use of Weak Hash in github.com/mattermost/mattermost-server↗2025-09-17
▶
CVEList
Weak cache keys lead to post IDOR and link preview poisoning↗2025-09-15
▶
OSV
Mattermost makes Use of Weak Hash↗2025-09-15
▶
GHSA
Mattermost makes Use of Weak Hash↗2025-09-15
▶
CVE-2025-9078 — Use of Weak Hash | cvebase