Junglewise Threat Intelligence
CVE-2026-27659: GO-2026-5629 - Mattermost doesn't properly validate CSRF tokens in github.com/mattermost/mattermost-server
CVE-2026-27659 · Severity: low · CVSS 3.1 · Published 2026-06-25
Technologies: github.com/mattermost/mattermost-server/v5 (Go), github.com/mattermost/mattermost-server/v6 (Go), github.com/mattermost/mattermost/server/v8 (Go), github.com/mattermost/mattermost-server (Go). Vendors: Go.
Executive brief
Mattermost doesn't properly validate CSRF tokens in github.com/mattermost/mattermost-server
Affected products
- Go github.com/mattermost/mattermost-server/v5
- Go github.com/mattermost/mattermost-server/v6
- Go github.com/mattermost/mattermost/server/v8
- Go github.com/mattermost/mattermost-server