CVE-2023-23622 Information

Description

Discourse is an open-source discussion platform. Prior to version 3.0.1 of the stable branch and version 3.1.0.beta2 of the beta and tests-passed branches the count of topics displayed for a tag is a count of all regular topics regardless of whether the topic is in a read restricted category or not. As a result any users can technically poll a sensitive tag to determine if a new topic is created in a category which the user does not have excess to. In version 3.0.1 of the stable branch and version 3.1.0.beta2 of the beta and tests-passed branches the count of topics displayed for a tag defaults to only counting regular topics which are not in read restricted categories. Staff users will continue to see a count of all topics regardless of the topic’s category read restrictions.

Reference

https://github.com/discourse/discourse/pull/20004 https://github.com/discourse/discourse/pull/20005 https://github.com/discourse/discourse/commit/105fee978d73b0ec23ff814a09d1c0c9ace95164 https://github.com/discourse/discourse/commit/ecb9aa5dba94741d9579f4f873f0675f48b4184f https://github.com/discourse/discourse/security/advisories/GHSA-2wvr-4x7w-v795