HTML injection in oneboxed links
Priority LOW 35CWE-74Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-79.
Summary
Discourse is an open source platform for community discussion. Prior to version 3.1.3 of the `stable` branch and version 3.2.0.beta3 of the `beta` and `tests-passed` branches, some links can inject arbitrary HTML tags when rendered through our Onebox engine. The issue is patched in version 3.1.3 of the `stable` branch and version 3.2.0.beta3 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 0.00943 61st percentileScored 2026-11-07
Fix Fixed discourse (discourse): 3.1.3, 3.2.0.beta3
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- 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 | before 3.1.3; 3.2.0.beta0 to before 3.2.0.beta3 | 3.1.3, 3.2.0.beta3 | Patch available | CNA |
- discourse Vendordiscourse Affected before 3.1.3; 3.2.0.beta0 to before 3.2.0.beta3 Fixed in 3.1.3, 3.2.0.beta3 Patch available CNA
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:discourse:discourse:*:*:*:*:stable:*:*:* | before 3.1.3 | Vulnerable | discourse |
| cpe:2.3:a:discourse:discourse:*:*:*:*:beta:*:*:* | before 3.2.0 | Vulnerable | discourse |
| cpe:2.3:a:discourse:discourse:3.2.0:beta1:*:*:beta:*:*:* | 3.2.0 beta1 | Vulnerable | discourse |
| cpe:2.3:a:discourse:discourse:3.2.0:beta2:*:*:beta:*:*:* | 3.2.0 beta2 | Vulnerable | discourse |
- cpe:2.3:a:discourse:discourse:*:*:*:*:stable:*:*:* Versions before 3.1.3 Vulnerable ·discourse
- cpe:2.3:a:discourse:discourse:*:*:*:*:beta:*:*:* Versions before 3.2.0 Vulnerable ·discourse
- cpe:2.3:a:discourse:discourse:3.2.0:beta1:*:*:beta:*:*:* Versions 3.2.0 beta1 Vulnerable ·discourse
- cpe:2.3:a:discourse:discourse:3.2.0:beta2:*:*:beta:*:*:* Versions 3.2.0 beta2 Vulnerable ·discourse
Remediation
- Fix · CNA discourse (discourse) Fixed in 3.1.3, 3.2.0.beta3
Timeline
- 2026-10-02 Threatist record created from CVE-2023-47119
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