CVE-2023-22453: Discourse

Medium severity, CVSS 5.3. EPSS: 0.6% chance of exploitation in the next 30 days.

Discourse is an option source discussion platform. Prior to version 2.8.14 on the `stable` branch and version 3.0.0.beta16 on the `beta` and `tests-passed` branches, the number of times a user posted in an arbitrary topic is exposed to unauthorized users through the `/u/username.json` endpoint. The issue is patched in version 2.8.14 and 3.0.0.beta16. There is no known workaround.

Affected products

• Discourse Discourse: before 2.8.14 (fixed in 2.8.14); version 1.1.0 only; version 1.2.0 only; version 1.3.0 only; version 1.4.0 only; version 1.5.0 only; …

Published 2023-01-05. Last modified 2026-06-17.