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Go/github.com/mattermost/mattermost-server CVE-2026-28741: high 8.1, EPSS 0.13%

Mattermost doesn't validate CSRF tokens on an authentication endpoint in github.com/mattermost/mattermost-server

Action: Upgrade github.com/mattermost/mattermost-server to 11.3.3+incompatible or later.

go get github.com/mattermost/mattermost-server@v11.3.3+incompatible
go get github.com/mattermost/mattermost-server@v11.4.3+incompatible
go get github.com/mattermost/mattermost-server@v11.5.0+incompatible

Affected

introducedfixedlast affected
11.3.0-rc1+incompatible11.3.3+incompatible-
11.4.0-rc1+incompatible11.4.3+incompatible-
11.5.0-rc1+incompatible11.5.0+incompatible-

Fixed versions

11.3.3+incompatible11.4.3+incompatible11.5.0+incompatible

Sources

CVE-2026-28741 · published · modified · JSON