CVE-2023-47119
Published: 10 November 2023
Summary
CVE-2023-47119 is a medium-severity Injection (CWE-74) vulnerability in Discourse Discourse. Its CVSS base score is 5.3 (Medium).
Operationally, ranked in the top 5.4% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
Deeper analysis
Discourse is an open source discussion platform whose Onebox link-rendering engine is affected by CVE-2023-47119. Prior to versions 3.1.3 (stable) and 3.2.0.beta3 (beta and tests-passed), specially crafted links could cause arbitrary HTML tags to be injected during rendering. The flaw is tracked under CWE-74 and CWE-79 and carries a CVSS 3.1 score of 5.3 reflecting network attackability with low complexity and no authentication or user interaction required, resulting in limited availability impact.
An unauthenticated remote attacker can supply a malicious link that is processed by the Onebox engine, allowing HTML injection that may degrade service availability for users viewing the affected post. No confidentiality or integrity impact is indicated by the CVSS vector.
The official GitHub Security Advisory and accompanying commits state that the issue is resolved in the cited releases and that no workarounds are known; administrators are therefore advised to upgrade promptly. The associated EPSS score has remained flat at 0.1424 with no material increase since disclosure.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2023-51262
Vulnerability details
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…
more
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.
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Penetration testing submits XSS payloads to web applications, detecting cross-site scripting flaws for subsequent remediation.
Developer assessments and testing (including injection-focused techniques) identify improper neutralization of special elements, and the verifiable flaw remediation corrects them pre-deployment.
Validates web inputs to reject script-related content that could produce XSS.
Output validation against expected content can reject or sanitize script content in generated web pages, reducing XSS exploitability.
Identifies indicators of injection attacks (command, SQL, LDAP, etc.) via anomaly and attack monitoring.