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
Problem types
Product status
10.8.0 (semver)
10.5.0 (semver)
9.11.0 (semver)
10.10.0 (semver)
10.9.0 (semver)
10.11.0
10.8.4
10.5.9
9.11.18
10.10.2
10.9.4
Credits
daw10 
References
mattermost.com/security-updates