tocsin

Go/github.com/mattermost/mattermost/server/v8 CVE-2026-27656: medium 6.1, EPSS 0.18%

Mattermost allows attackers to take over arbitrary user accounts via overly permissive substring matching flaw in github.com/mattermost/mattermost-server

Action: Upgrade github.com/mattermost/mattermost/server/v8 to 8.0.0-20260217110922-b7d4a1f1f59b or later.

go get github.com/mattermost/mattermost/server/v8@v8.0.0-20260217110922-b7d4a1f1f59b

Affected

introducedfixedlast affected
8.0.0-20260105080200-d27a2195068d8.0.0-20260217110922-b7d4a1f1f59b-

Fixed versions

8.0.0-20260217110922-b7d4a1f1f59b

Sources

CVE-2026-27656 · published · modified · JSON