CVE-2023-30606: Discourse

Medium severity, CVSS 4.9. EPSS: 0.4% chance of exploitation in the next 30 days.

Discourse is an open source platform for community discussion. In affected versions a user logged as an administrator can call arbitrary methods on the `SiteSetting` class, notably `#clear_cache!` and `#notify_changed!`, which when done on a multisite instance, can affect the entire cluster resulting in a denial of service. Users not running in multisite environments are not affected. This issue is patched in the latest stable, beta and tests-passed versions of Discourse. Users are advised to upgrade. There are no known workarounds for this vulnerability.

Affected products

• Discourse Discourse: up to and including 3.0.1; before 3.1.0 (fixed in 3.1.0); version 3.1.0 only

Published 2023-04-18. Last modified 2026-06-17.