CVE-2023-28111: Discourse

High severity, CVSS 7.5. EPSS: 0.6% chance of exploitation in the next 30 days.

Discourse is an open-source discussion platform. Prior to version 3.1.0.beta3 of the `beta` and `tests-passed` branches, attackers are able to bypass Discourse's server-side request forgery (SSRF) protection for private IPv4 addresses by using a IPv4-mapped IPv6 address. The issue is patched in the latest beta and tests-passed version of Discourse. version 3.1.0.beta3 of the `beta` and `tests-passed` branches. There are no known workarounds.

Affected products

• Discourse Discourse: before 3.1.0 (fixed in 3.1.0); version 3.1.0 only

Published 2023-03-17. Last modified 2026-06-17.