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TI-2023-17085 Aliases CVE-2023-34250

Discourse vulnerable to exposure of number of topics recently created in private categories

Priority LOW 24CWE-200Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Information disclosure
Confidentiality · integrity · availability
Low · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-200.

Summary

Discourse is an open source discussion platform. Prior to version 3.0.4 of the `stable` branch and version 3.1.0.beta5 of the `beta` and `tests-passed` branches, an attacker could use the new topics dismissal endpoint to reveal the number of topics recently created (but not the actual content thereof) in categories they didn't have access to. This issue is patched in version 3.0.4 of the `stable` branch and version 3.1.0.beta5 of the `beta` and `tests-passed` branches. There are no known workarounds.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00399 34th percentileScored 2026-11-07
Fix Fixed discourse (discourse): 3.0.4, 3.1.0.beta5

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
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
discoursediscoursebefore 3.0.4; 3.1.0.beta1 to before 3.1.0.beta53.0.4, 3.1.0.beta5Patch availableCNA
  • discourse Vendordiscourse Affected before 3.0.4; 3.1.0.beta1 to before 3.1.0.beta5 Fixed in 3.0.4, 3.1.0.beta5 Patch available CNA

CPE configurations NVD · 5

CPEVersionsRoleVendor
cpe:2.3:a:discourse:discourse:*:*:*:*:stable:*:*:*before 3.0.4Vulnerablediscourse
cpe:2.3:a:discourse:discourse:3.1.0:beta1:*:*:beta:*:*:*3.1.0 beta1Vulnerablediscourse
cpe:2.3:a:discourse:discourse:3.1.0:beta2:*:*:beta:*:*:*3.1.0 beta2Vulnerablediscourse
cpe:2.3:a:discourse:discourse:3.1.0:beta3:*:*:beta:*:*:*3.1.0 beta3Vulnerablediscourse
cpe:2.3:a:discourse:discourse:3.1.0:beta4:*:*:beta:*:*:*3.1.0 beta4Vulnerablediscourse
  • cpe:2.3:a:discourse:discourse:*:*:*:*:stable:*:*:* Versions before 3.0.4 Vulnerable ·discourse
  • cpe:2.3:a:discourse:discourse:3.1.0:beta1:*:*:beta:*:*:* Versions 3.1.0 beta1 Vulnerable ·discourse
  • cpe:2.3:a:discourse:discourse:3.1.0:beta2:*:*:beta:*:*:* Versions 3.1.0 beta2 Vulnerable ·discourse
  • cpe:2.3:a:discourse:discourse:3.1.0:beta3:*:*:beta:*:*:* Versions 3.1.0 beta3 Vulnerable ·discourse
  • cpe:2.3:a:discourse:discourse:3.1.0:beta4:*:*:beta:*:*:* Versions 3.1.0 beta4 Vulnerable ·discourse

Remediation

  • Fix · CNA discourse (discourse) Fixed in 3.0.4, 3.1.0.beta5

Timeline

  1. 2026-10-02 Threatist record created from CVE-2023-34250

References

Advisory 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-2026-24651 Discourse: Open redirect via `sso_destination_url` cookie in `enter` CVSS 4.0MEDIUM 5.1
  • 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
See all 262 →

Sources

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