CVE-2021-47936

OpenCATS 0.9.4 Remote Code Execution via Resume Upload

CVSS 9.3 CRITICALEPSS 0.7%CWE-306

Vexday Risk Score

48Attention

SSVC decision (CISA)

Attend

PoC available → attend closely

CVSS 9.3EPSS 0.7%KEV nãoPoC públicaNuclei —Metasploit —Patch —

Lifecycle

10 May 2026Published on NVD

Recommendation: Plan a near-term fix — a public PoC already exists.

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:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Affected products

Opencats · OpenCATS

public PoCs found — 1

cve_referencewww.exploit-db.com/exploits/50585unverified

⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.

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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