Detections
Analytics
CVE-2026-72724
medium
Description
Discourse is an open-source discussion platform. Prior to 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0, plugins/chat/lib/chat/onebox_handler.rb resolves Chat::Thread by route thread_id independently of the route channel_id before checking whether the user can preview the selected chat channel. An authenticated user can pair a public channel ID with a private thread ID in a /onebox.json request and obtain private thread message content. This issue is fixed in versions 2026.1.6, 2026.5.2, 2026.6.1, and 2026.7.0.
References
https://github.com/discourse/discourse/security/advisories/GHSA-8g98-fvfc-9w48
https://github.com/discourse/discourse/pull/42094
https://github.com/discourse/discourse/pull/42093
https://github.com/discourse/discourse/pull/42092
https://github.com/discourse/discourse/pull/42091
https://github.com/discourse/discourse/commit/dc54846f0754799591717b6018343e49524e41ce
https://github.com/discourse/discourse/commit/49efe1d7f098f2ce7301908815a211cc9248270f
https://github.com/discourse/discourse/commit/45ab6d54076de9ca4965888974d4416d5b48e83c
https://github.com/discourse/discourse/commit/1276d7032af8803956c74ae87ccfd976938dcd75