Cache poisoning via maliciously-formed request in discourse
Priority LOW 26CWE-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 a platform for community discussion. In affected versions a maliciously crafted request could cause an error response to be cached by intermediate proxies. This could cause a loss of confidentiality for some content. This issue is patched in the latest stable, beta and tests-passed versions of Discourse.
Why it matters now
EPSS 0.00969 62nd percentileScored 2026-11-07
Fix Fixed discourse (discourse): 2.7.10, 2.8.0.beta8
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 | before 2.7.10; 2.8.0 to before 2.8.0.beta8 | 2.7.10, 2.8.0.beta8 | Patch available | CNA |
- discourse Vendordiscourse Affected before 2.7.10; 2.8.0 to before 2.8.0.beta8 Fixed in 2.7.10, 2.8.0.beta8 Patch available CNA
CPE configurations NVD · 8
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:* | up to 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:2.8.0:beta7:*:*:*:*:*:* | 2.8.0 beta7 | Vulnerable | discourse |
- cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:* Versions up to 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
- cpe:2.3:a:discourse:discourse:2.8.0:beta7:*:*:*:*:*:* Versions 2.8.0 beta7 Vulnerable ·discourse
Remediation
- Fix · CNA discourse (discourse) Fixed in 2.7.10, 2.8.0.beta8
Timeline
- 2026-10-02 Threatist record created from CVE-2021-41271
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