What’s Vulnerable › Vulnerabilities

CVE-2021-47936: OpenCATS 0.9.4 Remote Code Execution via Resume Upload

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-10 · updated 2026-10-06
• Weakness: CWE-306

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

• OpenCATS: through 0.9.4

References

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

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