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
References (1)
Scores
CVSS v3
4.3
EPSS
0.0002
EPSS Percentile
6.1%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-328
Status
published
Products (3)
mattermost/mattermost
0 - 8.0.0-20250718075842-cd87e5c87737Go
mattermost/mattermost-server
10.8.0 - 10.8.4Go
mattermost/mattermost_server
9.11.0 - 9.11.18
Published
Sep 15, 2025
Tracked Since
Feb 18, 2026