Description
Mattermost versions 10.8.x <= 10.8.3, 10.5.x <= 10.5.8, 9.11.x <= 9.11.17, 10.9.x <= 10.9.2, 10.10.x <= 10.10.0 fail to validate upload types in remote cluster upload sessions which allows a system admin to upload non-attachment file types via shared channels that could potentially be placed in arbitrary filesystem directories.
Problem types
CWE-434: Unrestricted Upload of File with Dangerous Type
Product status
10.8.0
10.5.0
9.11.0
10.9.0
10.10.0
10.11.0
10.8.4
10.5.9
9.11.18
10.9.3
10.10.1
Credits
daw10
References
mattermost.com/security-updates