CVE-2023-34747
Published: 14 June 2023
Summary
CVE-2023-34747 is a critical-severity Unrestricted Upload of File with Dangerous Type (CWE-434) vulnerability in Ujcms Ujcms. Its CVSS base score is 9.8 (Critical).
Operationally, ranked in the top 3.3% 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-2023-34747 is an unrestricted file upload vulnerability, tracked under CWE-434, that affects the ujcms content management system at version 6.0.2. The flaw resides in the web endpoint /api/backend/core/web-file-upload/upload and carries a CVSS 3.1 base score of 9.8, reflecting network-accessible exploitation with no required authentication or user interaction and full impact on confidentiality, integrity, and availability.
An unauthenticated remote attacker can send crafted requests to the upload endpoint to place arbitrary files on the server. Successful exploitation allows the attacker to achieve code execution or other high-impact actions by uploading files with dangerous types that the application does not adequately restrict.
Public references consist of GitHub issue reports that document the flaw; no vendor advisory or patch details are supplied in the available references. The associated EPSS score has reached 0.2898 without a documented rise from a materially lower baseline.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2023-38789
Vulnerability details
File upload vulnerability in ujcms 6.0.2 via /api/backend/core/web-file-upload/upload.
- 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.
Requiring identifiable owners for portable devices reduces the attack surface for unrestricted uploads of dangerous file types via anonymous media.
Dangerous file uploads can be detonated in the chamber to determine malice before any production write or execution occurs.
Prevents unrestricted writing of arbitrary or malicious firmware by keeping hardware write-protect enabled except under tightly controlled manual procedures.
Scans files from external sources on download/open/execute, blocking unrestricted uploads of dangerous file types.