CVE-2021-47936

CRITICAL EPSS 46.8%
Published May 10, 20261mo ago · Modified Jun 17, 20261w ago
9.3 CVSS 4.0
Critical
Find Similar
Published May 10, 2026 1mo ago
Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score
9.3
Exploitability
—
Impact
—
Vector string
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
46.8% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-306 Missing Authentication for Critical Function Authentication

References 4

  • github.com https://github.com/opencats/OpenCATS
  • exploit-db.com https://www.exploit-db.com/exploits/50585
  • opencats.org https://www.opencats.org/
  • vulncheck.com https://www.vulncheck.com/advisories/opencats-remote-code-execution-via-resume-upload

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.