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Go/github.com/mattermost/mattermost/server/v8 CVE-2026-6343: medium 4.3, EPSS 0.17%

Mattermost doesn't check public/private permissions

Action: Upgrade github.com/mattermost/mattermost/server/v8 to 10.11.14 or later.

go get github.com/mattermost/mattermost/server/v8@v11.5.2
go get github.com/mattermost/mattermost/server/v8@v11.4.4
go get github.com/mattermost/mattermost/server/v8@v10.11.14

Affected

introducedfixedlast affected
11.5.011.5.2-
11.4.011.4.4-
10.11.010.11.14-

Fixed versions

11.5.211.4.410.11.14

Sources

CVE-2026-6343 · published · modified · JSON