CVE-2021-47936

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-05-10. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 9.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
9.8
EG Score
9.8(medium)
EG Risk
75(Attend)
EG Risk 75/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS
47.6%
KEV
Not listed

Published

May 10, 2026

Last Modified

July 24, 2026

Advisory Details (4)

Auto-updated May 10, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic

OpenCATS 0.9.4 Remote Code Execution via Resume Upload | Advisories | VulnCheck

https://www.vulncheck.com/advisories/opencats-remote-code-execution-via-resume-upload
generic

Home - OpenCATS Applicant Tracking System

https://www.opencats.org/
generic🟡 PoC Available

OpenCATS 0.9.4 - Remote Code Execution (RCE) - PHP webapps Exploit

https://www.exploit-db.com/exploits/50585
generic

GitHub - opencats/OpenCATS: Open-source applicant tracking system (ATS) and recruitment CRM for staffing agencies and hiring teams. · GitHub

https://github.com/opencats/OpenCATS

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 13× in last 7d / 53× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 227 total refreshes for this CVE.

  1. 2026-07-24 14:15 UTCEPSS rescore
  2. 2026-07-24 14:15 UTCEPSS rescore
  3. 2026-07-23 14:16 UTCEPSS rescore
  4. 2026-07-23 02:06 UTCEG score recompute
  5. 2026-07-22 22:53 UTCEG score recompute
  6. 2026-07-22 14:06 UTCEPSS rescore
  7. 2026-07-21 15:22 UTCEPSS rescore
  8. 2026-07-21 15:22 UTCEPSS rescore
  9. 2026-07-20 17:05 UTCEPSS rescore
  10. 2026-07-19 14:29 UTCEPSS rescore
  11. 2026-07-19 02:27 UTCEPSS rescore
  12. 2026-07-19 02:27 UTCEPSS rescore
  13. 2026-07-18 10:02 UTCEPSS rescore
  14. 2026-07-16 17:00 UTCEPSS rescore
  15. 2026-07-16 17:00 UTCEPSS rescore
  16. 2026-07-15 16:55 UTCEPSS rescore
  17. 2026-07-15 01:58 UTCEPSS rescore
  18. 2026-07-15 01:58 UTCEPSS rescore
  19. 2026-07-13 22:27 UTCEPSS rescore
  20. 2026-07-13 06:11 UTCEPSS rescore
  21. 2026-07-13 06:11 UTCEPSS rescore
  22. 2026-07-12 05:44 UTCEPSS rescore
  23. 2026-07-11 08:25 UTCEPSS rescore
  24. 2026-07-09 19:07 UTCEPSS rescore
  25. 2026-07-09 19:07 UTCEPSS rescore
Show 75 more
  1. 2026-07-08 15:12 UTCEPSS rescore
  2. 2026-07-08 15:12 UTCEPSS rescore
  3. 2026-07-07 13:43 UTCEPSS rescore
  4. 2026-07-06 16:25 UTCEPSS rescore
  5. 2026-07-06 16:25 UTCEPSS rescore
  6. 2026-07-06 02:21 UTCEPSS rescore
  7. 2026-07-06 02:21 UTCEPSS rescore
  8. 2026-07-05 02:28 UTCEPSS rescore
  9. 2026-07-05 02:28 UTCEPSS rescore
  10. 2026-07-04 06:29 UTCEPSS rescore
  11. 2026-07-04 06:29 UTCEPSS rescore
  12. 2026-07-01 15:04 UTCEPSS rescore
  13. 2026-06-30 23:20 UTCEPSS rescore
  14. 2026-06-29 14:04 UTCEPSS rescore
  15. 2026-06-29 14:04 UTCEPSS rescore
  16. 2026-06-28 14:05 UTCEPSS rescore
  17. 2026-06-28 08:53 UTCGHSA enrichment
  18. 2026-06-28 04:54 UTCEPSS rescore
  19. 2026-06-28 04:54 UTCEPSS rescore
  20. 2026-06-28 03:30 UTCGHSA enrichment
  21. 2026-06-27 14:40 UTCGHSA enrichment
  22. 2026-06-27 10:17 UTCGHSA enrichment
  23. 2026-06-27 03:07 UTCEPSS rescore
  24. 2026-06-27 03:06 UTCEPSS rescore
  25. 2026-06-26 21:09 UTCGHSA enrichment
  26. 2026-06-26 05:24 UTCGHSA enrichment
  27. 2026-06-25 13:48 UTCEPSS rescore
  28. 2026-06-25 13:48 UTCEPSS rescore
  29. 2026-06-24 14:03 UTCEPSS rescore
  30. 2026-06-24 14:03 UTCEPSS rescore
  31. 2026-06-23 21:31 UTCEPSS rescore
  32. 2026-06-23 21:31 UTCEPSS rescore
  33. 2026-06-22 14:24 UTCEPSS rescore
  34. 2026-06-21 14:55 UTCEPSS rescore
  35. 2026-06-21 01:58 UTCEPSS rescore
  36. 2026-06-21 01:58 UTCEPSS rescore
  37. 2026-06-19 19:24 UTCEPSS rescore
  38. 2026-06-19 19:24 UTCEPSS rescore
  39. 2026-06-18 17:51 UTCEPSS rescore
  40. 2026-06-18 17:51 UTCEPSS rescore
  41. 2026-06-17 17:51 UTCEPSS rescore
  42. 2026-06-17 17:51 UTCEPSS rescore
  43. 2026-06-17 05:36 UTCGHSA enrichment
  44. 2026-06-17 01:09 UTCGHSA enrichment
  45. 2026-06-16 17:51 UTCEPSS rescore
  46. 2026-06-16 07:42 UTCGHSA enrichment
  47. 2026-06-15 17:46 UTCEPSS rescore
  48. 2026-06-15 04:33 UTCGHSA enrichment
  49. 2026-06-15 00:12 UTCGHSA enrichment
  50. 2026-06-14 23:15 UTCEPSS rescore
  51. 2026-06-14 23:15 UTCEPSS rescore
  52. 2026-06-14 19:46 UTCGHSA enrichment
  53. 2026-06-14 15:25 UTCGHSA enrichment
  54. 2026-06-14 11:04 UTCGHSA enrichment
  55. 2026-06-14 06:43 UTCGHSA enrichment
  56. 2026-06-14 02:13 UTCGHSA enrichment
  57. 2026-06-13 22:58 UTCEPSS rescore
  58. 2026-06-13 22:58 UTCEPSS rescore
  59. 2026-06-13 08:53 UTCGHSA enrichment
  60. 2026-06-12 23:10 UTCEPSS rescore
  61. 2026-06-12 22:48 UTCGHSA enrichment
  62. 2026-06-12 18:27 UTCGHSA enrichment
  63. 2026-06-12 11:45 UTCGHSA enrichment
  64. 2026-06-12 07:24 UTCGHSA enrichment
  65. 2026-06-12 03:04 UTCGHSA enrichment
  66. 2026-06-11 22:43 UTCGHSA enrichment
  67. 2026-06-11 18:23 UTCGHSA enrichment
  68. 2026-06-11 13:58 UTCEPSS rescore
  69. 2026-06-11 13:49 UTCGHSA enrichment
  70. 2026-06-11 09:28 UTCGHSA enrichment
  71. 2026-06-11 05:07 UTCGHSA enrichment
  72. 2026-06-11 00:43 UTCGHSA enrichment
  73. 2026-06-10 22:16 UTCEPSS rescore
  74. 2026-06-10 20:22 UTCGHSA enrichment
  75. 2026-06-10 16:01 UTCGHSA enrichment

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Frequently asked(5)

What is CVE-2021-47936?
CVE-2021-47936 is a critical vulnerability published on May 10, 2026. 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…
When was CVE-2021-47936 disclosed?
CVE-2021-47936 was first published in the National Vulnerability Database on May 10, 2026, with the most recent update on July 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-47936 actively exploited?
CVE-2021-47936 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 47.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2021-47936?
CVE-2021-47936 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2021-47936?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-47936, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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