CVE-2022-39241: Discourse

Medium severity, CVSS 4.9. EPSS: 0.6% chance of exploitation in the next 30 days.

Discourse is a platform for community discussion. A malicious admin could use this vulnerability to perform port enumeration on the local host or other hosts on the internal network, as well as against hosts on the Internet. Latest `stable`, `beta`, and `test-passed` versions are now patched. As a workaround, self-hosters can use `DISCOURSE_BLOCKED_IP_BLOCKS` env var (which overrides `blocked_ip_blocks` setting) to stop webhooks from accessing private IPs.

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.