CVE-2023-39007
Published: 09 August 2023
Summary
CVE-2023-39007 is a critical-severity Cross-site Scripting (CWE-79) vulnerability in Opnsense Opnsense. Its CVSS base score is 9.6 (Critical).
Operationally, ranked in the top 1.9% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
Deeper analysis
CVE-2023-39007 is a cross-site scripting vulnerability (CWE-79) in the Cron component of OPNsense. It affects Community Edition versions before 23.7 and Business Edition versions before 23.4.2, specifically in the /ui/cron/item/open endpoint handled by openAction in app/controllers/OPNsense/Cron/ItemController.php.
An attacker can supply a crafted request to the affected endpoint that executes arbitrary script in the context of a victim user who follows a malicious link. Because the CVSS vector shows no required privileges, low attack complexity, and changed scope, successful exploitation can lead to full compromise of confidentiality, integrity, and availability within the OPNsense web interface.
Public references point to the official fix published in the 23.7 and 23.4.2 releases; the corresponding commits sanitize input passed to the openAction method. The current EPSS score of 0.5415 indicates substantial exploitation interest following disclosure.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2023-42764
Vulnerability details
/ui/cron/item/open in the Cron component of OPNsense Community Edition before 23.7 and Business Edition before 23.4.2 allows XSS via openAction in app/controllers/OPNsense/Cron/ItemController.php.
- 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.
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.