CVE-2026-32113
Discourse: Open redirect via `sso_destination_url` cookie in `enter`
- State
- Published
- Severity
- 5.1 Medium
- Published
- Mar 31, 2026
- Updated
- Apr 1, 2026
- Reserved
- Mar 10, 2026
Description
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, the enter action in StaticController reads the sso_destination_url cookie and redirects to it with allow_other_host: true without validating the destination URL. While this cookie is normally set during legitimate DiscourseConnect Provider flows with cryptographically validated SSO payloads, cookies are client-controlled and can be set by attackers. This issue has been patched in versions 2026.1.3, 2026.2.2, and 2026.3.0.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 5.1 Medium | CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N | GitHub_M |
Weaknesses
- CWE-601 URL Redirection to Untrusted Site ('Open Redirect')
Affected Products
| Product | Versions |
|---|---|
discoursediscourse |
|
References
- https://github.com/discourse/discourse/security/advisories/GHSA-378j-ccw4-4fwh
- https://github.com/discourse/discourse/commit/080408b93d00305b51d71f63f755f43fa601884d
- https://meta.discourse.org/t/using-discourse-as-a-sso-provider/32974
- https://meta.discourse.org/t/use-discourse-as-an-identity-provider-sso-discourseconnect/32974exploit
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