What’s Vulnerable › Vulnerabilities

CVE-2026-32113: Discourse: Open redirect via `sso_destination_url` cookie in `enter`

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-03-31 · updated 2026-07-24
• Weakness: CWE-601

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.

Affected products

• discourse: from 2026.1.0 before 2026.1.3; from 2026.2.0 before 2026.2.2; 2026.3.0 — fixed in 2026.1.3, 2026.2.2

How to fix

Upgrade to a fixed version: discourse 2026.1.3, 2026.2.2. Check the vendor advisory for mitigations.

References

• https://github.com/discourse/discourse/commit/080408b93d00305b51d71f63f755f43fa601884d
• https://github.com/discourse/discourse/security/advisories/GHSA-378j-ccw4-4fwh
• 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/32974

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