CVE-2026-59523

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory published 2026-07-13. 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.

Missing Authorization vulnerability in NSquared Simply Schedule Appointments simply-schedule-appointments allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects Simply Schedule Appointments: from n/a through <= 1.6.11.11.

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
18%
KEV
Not listed

Published

July 13, 2026

Last Modified

July 13, 2026

References (1)

Vendor Advisories for CVE-2026-59523(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 16× in last 7d / 80× 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 125 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-59523?
CVE-2026-59523 is a medium vulnerability published on July 13, 2026. Missing Authorization vulnerability in NSquared Simply Schedule Appointments simply-schedule-appointments allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects Simply Schedule Appointments: from n/a through <= 1.6.11.11.
When was CVE-2026-59523 disclosed?
CVE-2026-59523 was first published in the National Vulnerability Database on July 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-59523 actively exploited?
CVE-2026-59523 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 81.8% of all scored CVEs.
What is the CVSS score of CVE-2026-59523?
CVE-2026-59523 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-59523?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-59523, 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-2026-59523

Explore →

Is Your Infrastructure Affected by CVE-2026-59523?

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

Start Free Scan →Browse All CVEs