CVE-2025-9078

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...

Mattermost makes Use of Weak Hash

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...

CVE-2025-9078

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...

CVE-2025-9078

CVE-2025-9078 affects Mattermost server versions 9.11.x, 10.5.x, 10.8.x, 10.9.x, 10.10.x where cache key validation for link metadata is flawed due to FNV-1 hashing, enabling authenticated users to access posts they are not authorized to and to poison link previews. Root cause: improper validatio...