CVE-2022-41944: Discourse users can see notifications for topics they no longer have access to

First published: Mon Nov 28 2022(Updated: )

Discourse is an open-source discussion platform. In stable versions prior to 2.8.12 and beta or tests-passed versions prior to 2.9.0.beta.13, under certain conditions, a user can see notifications for topics they no longer have access to. If there is sensitive information in the topic title, it will therefore have been exposed. This issue is patched in stable version 2.8.12, beta version 2.9.0.beta13, and tests-passed version 2.9.0.beta13. There are no workarounds available.

Credit: security-advisories@github.com

Affected Software	Affected Version	How to fix
Discourse Discourse	<=2.8.11
Discourse Discourse	=2.9.0-beta1
Discourse Discourse	=2.9.0-beta10
Discourse Discourse	=2.9.0-beta11
Discourse Discourse	=2.9.0-beta12
Discourse Discourse	=2.9.0-beta2
Discourse Discourse	=2.9.0-beta3
Discourse Discourse	=2.9.0-beta4
Discourse Discourse	=2.9.0-beta5
Discourse Discourse	=2.9.0-beta6
Discourse Discourse	=2.9.0-beta7
Discourse Discourse	=2.9.0-beta8
Discourse Discourse	=2.9.0-beta9

Remedy

https://github.com/discourse/discourse/commit/c6ee28ec756436cc9ce154dd2c8e4c441f92f693

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