CVE-2021-47937
Published: 10 May 2026
Summary
CVE-2021-47937 is a high-severity Unrestricted Upload of File with Dangerous Type (CWE-434) vulnerability in E107 (inferred from references). Its CVSS base score is 8.8 (High).
Operationally, it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
Threat & Defense Details
Likely Mitigating ControlsAI
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.
NVD Description
e107 CMS 2.3.0 contains a remote code execution vulnerability that allows authenticated users with theme installation permissions to execute arbitrary commands by uploading malicious theme files. Attackers can upload a crafted theme package through the theme.php endpoint that deploys a…
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web shell to the e107_themes directory, then execute system commands via the payload.php script.
Deeper analysisAI
Automated synthesis unavailable for this CVE.
Details
- CWE(s)