Vulnerability CVE-2023-23622
Published: 2023-03-17

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.

Type:

CWE-200

 (Information Exposure)

 References:
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
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