Mattermost fails to properly restrict the access of files attached to posts in github.com/mattermost/mattermost-server

Mattermost fails to properly restrict the access of files attached to posts in github.com/mattermost/mattermost-server.

NOTE: The source advisory for this report contains additional versions that could not be automatically mapped to standard Go module versions.

(If this is causing false-positive reports from vulnerability scanners, please suggest an edit to the report.)

The additional affected modules and versions are: github.com/mattermost/mattermost/server/v8 before v8.1.9.