RCE via malicious SNS subscription payload
Priority MEDIUM 61CWE-74Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA.
Summary
Discourse is an open source platform for community discussion. In affected versions maliciously crafted requests could lead to remote code execution. This resulted from a lack of validation in subscribe_url values. This issue is patched in the latest stable, beta and tests-passed versions of Discourse. To workaround the issue without updating, requests with a path starting /webhooks/aws path could be blocked at an upstream proxy.
Why it matters now
EPSS 0.19812 97th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| discourse | discourse | tests-passed < 2.8.0.beta7; beta < 2.8.0.beta7; stable < 2.7.9 | — | No fix listed | CNA |
- discourse Vendordiscourse Affected tests-passed < 2.8.0.beta7; beta < 2.8.0.beta7; stable < 2.7.9 Fixed in — No fix listed CNA
CPE configurations NVD · 7
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:* | before 2.7.9 | Vulnerable | discourse |
| cpe:2.3:a:discourse:discourse:2.8.0:beta1:*:*:*:*:*:* | 2.8.0 beta1 | Vulnerable | discourse |
| cpe:2.3:a:discourse:discourse:2.8.0:beta2:*:*:*:*:*:* | 2.8.0 beta2 | Vulnerable | discourse |
| cpe:2.3:a:discourse:discourse:2.8.0:beta3:*:*:*:*:*:* | 2.8.0 beta3 | Vulnerable | discourse |
| cpe:2.3:a:discourse:discourse:2.8.0:beta4:*:*:*:*:*:* | 2.8.0 beta4 | Vulnerable | discourse |
| cpe:2.3:a:discourse:discourse:2.8.0:beta5:*:*:*:*:*:* | 2.8.0 beta5 | Vulnerable | discourse |
| cpe:2.3:a:discourse:discourse:2.8.0:beta6:*:*:*:*:*:* | 2.8.0 beta6 | Vulnerable | discourse |
- cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:* Versions before 2.7.9 Vulnerable ·discourse
- cpe:2.3:a:discourse:discourse:2.8.0:beta1:*:*:*:*:*:* Versions 2.8.0 beta1 Vulnerable ·discourse
- cpe:2.3:a:discourse:discourse:2.8.0:beta2:*:*:*:*:*:* Versions 2.8.0 beta2 Vulnerable ·discourse
- cpe:2.3:a:discourse:discourse:2.8.0:beta3:*:*:*:*:*:* Versions 2.8.0 beta3 Vulnerable ·discourse
- cpe:2.3:a:discourse:discourse:2.8.0:beta4:*:*:*:*:*:* Versions 2.8.0 beta4 Vulnerable ·discourse
- cpe:2.3:a:discourse:discourse:2.8.0:beta5:*:*:*:*:*:* Versions 2.8.0 beta5 Vulnerable ·discourse
- cpe:2.3:a:discourse:discourse:2.8.0:beta6:*:*:*:*:*:* Versions 2.8.0 beta6 Vulnerable ·discourse
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-41163
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-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
- TI-2024-33232 Bypass of Discourse Connect using other login paths if enabled in Discourse CVSS 3.1CRITICAL 9.1
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences