CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Lifecycle Timeline
3Description
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.
Analysis
Discourse versions 2026.1.0 through 2026.1.2, 2026.2.0 through 2026.2.1, and 2026.3.0 prior to patching allow authenticated users to disclose shared draft topic titles via specially crafted inline onebox requests that reference the shared drafts category. An attacker with valid Discourse credentials can enumerate and read draft titles not intended for their access, violating information confidentiality. …
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External POC / Exploit Code
Leaving vuln.today
EUVD-2026-17565