CVE-2026-66679

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory published 2026-08-18. a secondary CVSS source baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.5Exploit: None knownExposed: 0

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

Unauthenticated Broken Access Control in Appointment Hour Booking <= 1.5.91 versions.

CVSS v3
6.5
EG Score
6.5(medium)
EG Risk
34(Track)
EG Risk 34/100SSVC: Track

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
Severity65% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
27%
KEV
Not listed

Published

August 18, 2026

Last Modified

August 20, 2026

Advisory Details (1)

Auto-updated Aug 18, 2026
Patch available.
generic Patch Available

Broken Access Control in WordPress Appointment Hour Booking Plugin - Patchstack

https://patchstack.com/database/wordpress/plugin/appointment-hour-booking/vulnerability/wordpress-appointment-hour-booking-plugin-1-5-91-broken-access-control-vulnerability?_s_id=cve

Vendor Advisories for CVE-2026-66679(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 18× in last 7d / 78× 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.

  1. 2026-09-19 20:23 UTCEG score recompute
  2. 2026-09-19 20:23 UTCGHSA enrichment
  3. 2026-09-18 21:52 UTCEG score recompute
  4. 2026-09-18 21:52 UTCGHSA enrichment
  5. 2026-09-18 19:28 UTCEPSS rescore
  6. 2026-09-17 21:52 UTCEG score recompute
  7. 2026-09-17 21:52 UTCGHSA enrichment
  8. 2026-09-16 21:57 UTCEG score recompute
  9. 2026-09-16 21:57 UTCGHSA enrichment
  10. 2026-09-16 14:08 UTCEPSS rescore
  11. 2026-09-16 05:15 UTCEPSS rescore
  12. 2026-09-15 19:09 UTCEG score recompute
  13. 2026-09-15 19:09 UTCGHSA enrichment
  14. 2026-09-14 19:46 UTCGHSA enrichment
  15. 2026-09-13 20:47 UTCEG score recompute
  16. 2026-09-13 20:47 UTCGHSA enrichment
  17. 2026-09-12 22:16 UTCEG score recompute
  18. 2026-09-12 22:16 UTCGHSA enrichment
  19. 2026-09-11 23:43 UTCEG score recompute
  20. 2026-09-11 23:43 UTCGHSA enrichment
  21. 2026-09-11 14:53 UTCEPSS rescore
  22. 2026-09-11 09:37 UTCEPSS rescore
  23. 2026-09-11 00:40 UTCEG score recompute
  24. 2026-09-11 00:40 UTCGHSA enrichment
  25. 2026-09-10 02:00 UTCGHSA enrichment
Show 62 more
  1. 2026-09-09 03:28 UTCEG score recompute
  2. 2026-09-09 03:28 UTCGHSA enrichment
  3. 2026-09-08 22:01 UTCEPSS rescore
  4. 2026-09-07 16:09 UTCEG score recompute
  5. 2026-09-07 16:09 UTCGHSA enrichment
  6. 2026-09-07 16:01 UTCEPSS rescore
  7. 2026-09-06 16:17 UTCEG score recompute
  8. 2026-09-06 16:17 UTCGHSA enrichment
  9. 2026-09-06 13:47 UTCEPSS rescore
  10. 2026-09-05 17:45 UTCEG score recompute
  11. 2026-09-05 17:45 UTCGHSA enrichment
  12. 2026-09-05 15:31 UTCEPSS rescore
  13. 2026-09-04 19:02 UTCEG score recompute
  14. 2026-09-04 19:02 UTCGHSA enrichment
  15. 2026-09-04 05:07 UTCEPSS rescore
  16. 2026-09-03 20:29 UTCGHSA enrichment
  17. 2026-09-02 21:58 UTCEG score recompute
  18. 2026-09-02 21:58 UTCGHSA enrichment
  19. 2026-09-02 14:12 UTCEPSS rescore
  20. 2026-09-01 22:08 UTCEG score recompute
  21. 2026-09-01 22:08 UTCGHSA enrichment
  22. 2026-09-01 13:54 UTCEPSS rescore
  23. 2026-09-01 04:40 UTCEPSS rescore
  24. 2026-08-31 23:38 UTCGHSA enrichment
  25. 2026-08-31 01:06 UTCEG score recompute
  26. 2026-08-31 01:06 UTCGHSA enrichment
  27. 2026-08-30 19:17 UTCEPSS rescore
  28. 2026-08-30 02:35 UTCEG score recompute
  29. 2026-08-30 02:35 UTCGHSA enrichment
  30. 2026-08-30 01:22 UTCEPSS rescore
  31. 2026-08-29 04:03 UTCEG score recompute
  32. 2026-08-29 04:02 UTCGHSA enrichment
  33. 2026-08-28 21:42 UTCEPSS rescore
  34. 2026-08-28 01:19 UTCEG score recompute
  35. 2026-08-28 01:19 UTCGHSA enrichment
  36. 2026-08-27 02:44 UTCEG score recompute
  37. 2026-08-27 02:44 UTCGHSA enrichment
  38. 2026-08-26 14:47 UTCEPSS rescore
  39. 2026-08-26 04:13 UTCEG score recompute
  40. 2026-08-26 04:13 UTCGHSA enrichment
  41. 2026-08-25 13:49 UTCEPSS rescore
  42. 2026-08-25 05:36 UTCEG score recompute
  43. 2026-08-25 05:36 UTCGHSA enrichment
  44. 2026-08-24 07:05 UTCGHSA enrichment
  45. 2026-08-23 08:34 UTCEG score recompute
  46. 2026-08-23 08:34 UTCGHSA enrichment
  47. 2026-08-23 00:19 UTCEPSS rescore
  48. 2026-08-22 10:03 UTCEG score recompute
  49. 2026-08-22 10:03 UTCGHSA enrichment
  50. 2026-08-21 23:49 UTCEPSS rescore
  51. 2026-08-21 11:30 UTCEG score recompute
  52. 2026-08-21 11:30 UTCGHSA enrichment
  53. 2026-08-20 22:56 UTCEPSS rescore
  54. 2026-08-20 12:58 UTCGHSA enrichment
  55. 2026-08-19 18:55 UTCEG score recompute
  56. 2026-08-19 18:55 UTCGHSA enrichment
  57. 2026-08-19 17:04 UTCEPSS rescore
  58. 2026-08-18 20:24 UTCEG score recompute
  59. 2026-08-18 20:24 UTCGHSA enrichment
  60. 2026-08-18 15:20 UTCEG score recompute
  61. 2026-08-18 14:26 UTCEG score recompute
  62. 2026-08-18 14:19 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-66679?
CVE-2026-66679 is a medium vulnerability published on August 18, 2026. Unauthenticated Broken Access Control in Appointment Hour Booking <= 1.5.91 versions.
When was CVE-2026-66679 disclosed?
CVE-2026-66679 was first published in the National Vulnerability Database on August 18, 2026, with the most recent update on August 20, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-66679 actively exploited?
CVE-2026-66679 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 72.9% of all scored CVEs.
What is the CVSS score of CVE-2026-66679?
CVE-2026-66679 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-66679?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-66679, 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-2026-66679

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