CVE-2026-32951: Discourse: Authorization bypass in oneboxer via user-controlled category id
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 categoryid parameter matching the shared drafts category. This issue has been patched in versions 2026.1.3, 2026.2.2, and 2026.3.0.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Discourseto a version that resolves this vulnerability.Fixed in 2026.1.3 - Upgrade
Upgrade
Discourseto a version that resolves this vulnerability.Fixed in 2026.2.2 - Upgrade
Upgrade
Discourseto a version that resolves this vulnerability.Fixed in 2026.3.0
Event History
Frequently Asked Questions
What is the severity of CVE-2026-32951?
CVE-2026-32951 is classified as a medium severity vulnerability that permits authorization bypass for authenticated users.
How do I fix CVE-2026-32951?
To fix CVE-2026-32951, update Discourse to version 2026.1.3 or later, or 2026.2.2 or later.
What versions are affected by CVE-2026-32951?
CVE-2026-32951 affects Discourse versions from 2026.1.0 and below 2026.1.3, 2026.2.0 and below 2026.2.2, and below 2026.3.0.
What is the nature of the vulnerability in CVE-2026-32951?
CVE-2026-32951 allows an authenticated user to bypass authorization controls and access shared draft topics.
Who is impacted by CVE-2026-32951?
Authenticated users on affected versions of Discourse may exploit CVE-2026-32951, impacting the confidentiality of shared draft information.