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Vulnerability record · CVE-2021-47936 · published 10 May 2026

CVE-2021-47936: Missing authentication for critical function vulnerability

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.

9.3 CVSS 4.0 Critical EPSS 0.66% · top 50.6% CWE-306 · Missing authentication for critical function Deferred
9.3CVSS 4.0 base score
0.66%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
4References
25 Jul 2026Last modified by NVD

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: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:

References

LinkTags
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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Source: NIST National Vulnerability Database (record CVE-2021-47936), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.