Summaryinfo

A vulnerability has been found in Discourse up to 2026.1.2/2026.2.1 and classified as problematic. Impacted is an unknown function. This manipulation of the argument sso_destination_url causes redirect. The identification of this vulnerability is CVE-2026-32113. It is possible to initiate the attack remotely. There is no exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability has been found in Discourse up to 2026.1.2/2026.2.1 and classified as problematic. Affected by this vulnerability is an unknown part. The manipulation of the argument sso_destination_url with an unknown input leads to a redirect vulnerability. The CWE definition for the vulnerability is CWE-601. A web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a Redirect. This simplifies phishing attacks. As an impact it is known to affect integrity. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-32113 since 03/10/2026. The exploitation appears to be difficult. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1204.001 for this issue.

Upgrading to version 2026.1.3, 2026.2.2 or 2026.3.0 eliminates this vulnerability.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Chat Software

Name

• Discourse

Version

• 2026.1.0
• 2026.1.1
• 2026.1.2
• 2026.2.0
• 2026.2.1

License

• open-source

Website

• Product: https://github.com/discourse/discourse/

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