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TI-2026-24651 Aliases CVE-2026-32113

Discourse: Open redirect via `sso_destination_url` cookie in `enter`

Priority MEDIUM 56CWE-601Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Active
Attack complexity
High
Attack requirements
Present
Impact type
Spoofing
Confidentiality · integrity · availability
None · None · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-601.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00201 10th percentileScored 2026-11-07
Fix Fixed discourse (discourse): 2026.1.3, 2026.2.2, 2026.3.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
discoursediscourse2026.1.0-latest to before 2026.1.3; 2026.2.0-latest to before 2026.2.2; 2026.3.0-latest to before 2026.3.02026.1.3, 2026.2.2, 2026.3.0Patch availableCNA
  • discourse Vendordiscourse Affected 2026.1.0-latest to before 2026.1.3; 2026.2.0-latest to before 2026.2.2; 2026.3.0-latest to before 2026.3.0 Fixed in 2026.1.3, 2026.2.2, 2026.3.0 Patch available CNA

CPE configurations NVD · 3

CPEVersionsRoleVendor
cpe:2.3:a:discourse:discourse:*:*:*:*:latest:*:*:*2026.1.0 to before 2026.1.3; 2026.2.0 to before 2026.2.2Vulnerablediscourse
cpe:2.3:a:discourse:discourse:2026.3.0:*:*:*:latest:*:*:*2026.3.0Vulnerablediscourse
cpe:2.3:a:discourse:discourse:2026.3.0:*:*:*:latest.1:*:*:*2026.3.0Vulnerablediscourse
  • cpe:2.3:a:discourse:discourse:*:*:*:*:latest:*:*:* Versions 2026.1.0 to before 2026.1.3; 2026.2.0 to before 2026.2.2 Vulnerable ·discourse
  • cpe:2.3:a:discourse:discourse:2026.3.0:*:*:*:latest:*:*:* Versions 2026.3.0 Vulnerable ·discourse
  • cpe:2.3:a:discourse:discourse:2026.3.0:*:*:*:latest.1:*:*:* Versions 2026.3.0 Vulnerable ·discourse

Remediation

  • Fix · CNA discourse (discourse) Fixed in 2026.1.3, 2026.2.2, 2026.3.0

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-32113

References

Patch 1

Advisory 1

Other 1

  • TI-2021-19656 Denial of Service in discourse CVSS 3.1MEDIUM 6.8
  • TI-2024-36150 Potential Backup file leaked via Nginx in Discourse CVSS 3.1HIGH 7.5
  • TI-2021-18002 RCE via malicious SNS subscription payload CVSS 3.1CRITICAL 10.0
  • TI-2026-22278 Discourse leaks private topic title and post excerpt via user action API endpoint CVSS 4.0HIGH 8.7
  • TI-2023-24152 Unauthenticated access to new private chat messages in Discourse CVSS 3.1HIGH 7.5
  • TI-2024-33232 Bypass of Discourse Connect using other login paths if enabled in Discourse CVSS 3.1CRITICAL 9.1
See all 262 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences