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TI-2021-22549 Aliases CVE-2021-47936GHSA-6w77-cp2c-mfxq

OpenCATS 0.9.4 Remote Code Execution via Resume Upload

Priority HIGH 81CWE-306Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-306.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00656 51st percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
opencatsOpenCATSup to 0.9.4—No fix listedCNA
  • OpenCATS Vendoropencats Affected up to 0.9.4 Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-47936
  2. 2026-10-03 Alias added: GHSA-6w77-cp2c-mfxq
  3. 2026-10-12 EPSS moved to the 50th–90th percentile

References

Exploit 1

Other 2

  • TI-2026-22120 OpenCATS PHP Code Injection via installer AJAX endpoint CVSS 4.0CRITICAL 9.2
  • TI-2026-36639 OpenCATS - SQL Injection in DataGrid sortDirection Parameter CVSS 4.0HIGH 8.4
  • TI-2023-12031 Cross-site scripting in OpenCATS CVSS 3.1MEDIUM 6.1
  • TI-2023-12032 Cross-site scripting in OpenCATS CVSS 3.1MEDIUM 5.4
  • TI-2023-12030 Open redirect in OpenCATS CVSS 3.1MEDIUM 5.4
  • TI-2023-12033 Cross-site request forgery in OpenCATS CVSS 3.1MEDIUM 5.4
See all 37 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences