Discourse is an open-source discussion platform. From versions 2026.1.0-latest to before 2026.1.3, 2026.2.0-latest to before 2026.2.2, and 2026.3.0-latest to before 2026.3.0, an authenticated user can obtain shared draft topic titles by sending an inline onebox request with a category_id parameter matching the shared drafts category. This issue has been patched in versions 2026.1.3, 2026.2.2, and 2026.3.0.
https://github.com/discourse/discourse/security/advisories/GHSA-v93g-8f4f-4rgm
https://github.com/discourse/discourse/commit/0b4e6ff170362823d1cfe2a1a096785d0d77ee83