Discourse's WebAuthn challenge isn't cleared from user session after authentication
Priority LOW 36CWE-384Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Attack requirements
- Present
- Impact type
- Spoofing
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-384.
Summary
Discourse is an open-source community discussion platform. Prior to version 3.4.7 on the `stable` branch and version 3.5.0.beta.8 on the `tests-passed` branch, upon issuing a physical security key for 2FA, the server generates a WebAuthn challenge, which the client signs. The challenge is not cleared from the user’s session after authentication, potentially allowing reuse and increasing security risk. This is fixed in versions 3.4.7 and 3.5.0.beta.8.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00517 44th percentileScored 2026-11-07
Fix Fixed discourse (discourse): 3.5.0.beta.8, 3.4.7
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
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| discourse | discourse | 3.5.0.beta1 to before 3.5.0.beta.8; before 3.4.7 | 3.5.0.beta.8, 3.4.7 | Patch available | CNA |
- discourse Vendordiscourse Affected 3.5.0.beta1 to before 3.5.0.beta.8; before 3.4.7 Fixed in 3.5.0.beta.8, 3.4.7 Patch available CNA
CPE configurations NVD · 9
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:discourse:discourse:*:*:*:*:stable:*:*:* | before 3.4.6 | Vulnerable | discourse |
| cpe:2.3:a:discourse:discourse:*:*:*:*:beta:*:*:* | up to 3.5.0 | Vulnerable | discourse |
| cpe:2.3:a:discourse:discourse:3.5.0:beta1:*:*:beta:*:*:* | 3.5.0 beta1 | Vulnerable | discourse |
| cpe:2.3:a:discourse:discourse:3.5.0:beta2:*:*:beta:*:*:* | 3.5.0 beta2 | Vulnerable | discourse |
| cpe:2.3:a:discourse:discourse:3.5.0:beta3:*:*:beta:*:*:* | 3.5.0 beta3 | Vulnerable | discourse |
| cpe:2.3:a:discourse:discourse:3.5.0:beta4:*:*:beta:*:*:* | 3.5.0 beta4 | Vulnerable | discourse |
| cpe:2.3:a:discourse:discourse:3.5.0:beta5:*:*:beta:*:*:* | 3.5.0 beta5 | Vulnerable | discourse |
| cpe:2.3:a:discourse:discourse:3.5.0:beta6:*:*:beta:*:*:* | 3.5.0 beta6 | Vulnerable | discourse |
| cpe:2.3:a:discourse:discourse:3.5.0:beta7:*:*:beta:*:*:* | 3.5.0 beta7 | Vulnerable | discourse |
- cpe:2.3:a:discourse:discourse:*:*:*:*:stable:*:*:* Versions before 3.4.6 Vulnerable ·discourse
- cpe:2.3:a:discourse:discourse:*:*:*:*:beta:*:*:* Versions up to 3.5.0 Vulnerable ·discourse
- cpe:2.3:a:discourse:discourse:3.5.0:beta1:*:*:beta:*:*:* Versions 3.5.0 beta1 Vulnerable ·discourse
- cpe:2.3:a:discourse:discourse:3.5.0:beta2:*:*:beta:*:*:* Versions 3.5.0 beta2 Vulnerable ·discourse
- cpe:2.3:a:discourse:discourse:3.5.0:beta3:*:*:beta:*:*:* Versions 3.5.0 beta3 Vulnerable ·discourse
- cpe:2.3:a:discourse:discourse:3.5.0:beta4:*:*:beta:*:*:* Versions 3.5.0 beta4 Vulnerable ·discourse
- cpe:2.3:a:discourse:discourse:3.5.0:beta5:*:*:beta:*:*:* Versions 3.5.0 beta5 Vulnerable ·discourse
- cpe:2.3:a:discourse:discourse:3.5.0:beta6:*:*:beta:*:*:* Versions 3.5.0 beta6 Vulnerable ·discourse
- cpe:2.3:a:discourse:discourse:3.5.0:beta7:*:*:beta:*:*:* Versions 3.5.0 beta7 Vulnerable ·discourse
Remediation
- Fix · CNA discourse (discourse) Fixed in 3.5.0.beta.8, 3.4.7
Timeline
- 2026-10-02 Threatist record created from CVE-2025-53102
References
More Discourse vulnerabilities
- 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
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences