GO-2026-5256
Mattermost does not verify remote cluster channel access when processing shared channel membership removals in github.com/mattermost/mattermost-server
Details
Mattermost does not verify remote cluster channel access when processing shared channel membership removals 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/v5 before v5.3.2-0.20260216150504-8738f8c4b3d4.
Are you affected?
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Affected packages
10.11.0+incompatible Fixed in: 10.11.14+incompatible go get github.com/mattermost/mattermost-server@v10.11.14+incompatible 0 No fixed version published yet for github.com/mattermost/mattermost-server/v5 (go modules). Pin to a known-safe version or switch to an alternative.
0 No fixed version published yet for github.com/mattermost/mattermost-server/v6 (go modules). Pin to a known-safe version or switch to an alternative.
0 Fixed in: 8.0.0-20260216150504-8738f8c4b3d4 go get github.com/mattermost/mattermost/server/v8@v8.0.0-20260216150504-8738f8c4b3d4