Vulnerability · Published May 10, 2026 · Assigned by VulnCheck
CVE-2021-47936OpenCATS 0.9.4 Remote Code Execution via Resume Upload
Critical 9.8
In plain English
A critical-severity missing authentication in OpenCATS from Opencats. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 52% of all known vulnerabilities).
Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)0.7%top 48.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
OpenCATS 0.9.4 contains a remote code execution vulnerability that allows unauthenticated attackers to execute arbitrary commands by uploading malicious PHP files disguised as resume attachments. Attackers can upload PHP payloads through the careers job application endpoint and execute system commands via POST requests to the uploaded file in the upload directory.
Affected products (as reported)
Weakness: CWE-306 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References
- ExploitDB-50585 exploit
- Official Product Homepage product
- Product Reference product
- VulnCheck Advisory: OpenCATS 0.9.4 Remote Code Execution via Resume Upload third-party-advisory