CVE-2021-47966

HIGHNVD 8.28.2—
EchelonGraph scoreMEDIUM confidence

Score 8.2 from GitHub Security Advisory (severity: HIGH) published 2026-05-15. NVD baseline CVSS 8.2; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
8.2
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.2Exploit: NoneExposed: 0

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

PHP Timeclock 1.04 contains time-based and boolean-based blind SQL injection vulnerabilities in the login_userid parameter of login.php that allows unauthenticated attackers to extract database contents. Attackers can submit crafted POST requests with SQL payloads using SLEEP functions or RLIKE conditional statements to dump sensitive database information including employee names and credentials.

CVSS v3
8.2
EG Score
8.2(medium)
EPSS
18.8%
KEV
Not listed

Published

May 15, 2026

Last Modified

May 18, 2026

Advisory Details (4)

Auto-updated May 18, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic

PHP Timeclock 1.04 SQL Injection via login.php | Advisories | VulnCheck

https://www.vulncheck.com/advisories/php-timeclock-sql-injection-via-login-php
generic🟡 PoC Available

PHP Timeclock 1.04 - Time and Boolean Based Blind SQL Injection - PHP webapps Exploit

https://www.exploit-db.com/exploits/49849
generic

PHP Timeclock - Browse /PHP Timeclock/PHP Timeclock 1.04 at SourceForge.net

https://sourceforge.net/projects/timeclock/files/PHP%20Timeclock/PHP%20Timeclock%201.04/
generic

PHP Timeclock

http://timeclock.sourceforge.net

Vendor Advisories for CVE-2021-47966(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 10× in last 7d / 67× 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 201 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2021-47966?
CVE-2021-47966 is a high vulnerability published on May 15, 2026. PHP Timeclock 1.04 contains time-based and boolean-based blind SQL injection vulnerabilities in the login_userid parameter of login.php that allows unauthenticated attackers to extract database contents. Attackers can submit crafted POST requests with SQL payloads using SLEEP functions or RLIKE…
When was CVE-2021-47966 disclosed?
CVE-2021-47966 was first published in the National Vulnerability Database on May 15, 2026, with the most recent update on May 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-47966 actively exploited?
CVE-2021-47966 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 18.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2021-47966?
CVE-2021-47966 has a CVSS v3 base score of 8.2 (NVD).
How do I remediate CVE-2021-47966?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-47966, 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.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2021-47966

Explore →

Is Your Infrastructure Affected by CVE-2021-47966?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs