CVE-2022-39356: Discourse

High severity, CVSS 8.8. EPSS: 0.6% chance of exploitation in the next 30 days.

Discourse is a platform for community discussion. Users who receive an invitation link that is not scoped to a single email address can enter any non-admin user's email and gain access to their account when accepting the invitation. All users should upgrade to the latest version. A workaround is temporarily disabling invitations with `SiteSetting.max_invites_per_day = 0` or scope them to individual email addresses.

Affected products

• Discourse Discourse: before 2.8.10 (fixed in 2.8.10); version 2.9.0 only

Published 2022-11-02. Last modified 2026-06-17.