CVE-2026-59523

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreHIGH 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(high)
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
5%
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 20× 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.

  1. 2026-08-03 10:36 UTCEPSS rescore
  2. 2026-08-03 03:27 UTCGHSA enrichment
  3. 2026-08-02 04:40 UTCEG score recompute
  4. 2026-08-02 04:40 UTCGHSA enrichment
  5. 2026-08-02 02:27 UTCEPSS rescore
  6. 2026-08-01 05:53 UTCEG score recompute
  7. 2026-08-01 05:53 UTCGHSA enrichment
  8. 2026-08-01 04:16 UTCEPSS rescore
  9. 2026-07-31 07:03 UTCEG score recompute
  10. 2026-07-31 07:03 UTCGHSA enrichment
  11. 2026-07-30 16:28 UTCEPSS rescore
  12. 2026-07-30 08:16 UTCEG score recompute
  13. 2026-07-30 08:16 UTCGHSA enrichment
  14. 2026-07-30 01:30 UTCEPSS rescore
  15. 2026-07-30 01:30 UTCEPSS rescore
  16. 2026-07-29 08:21 UTCEG score recompute
  17. 2026-07-29 08:21 UTCGHSA enrichment
  18. 2026-07-28 15:37 UTCEPSS rescore
  19. 2026-07-28 09:30 UTCEG score recompute
  20. 2026-07-28 09:29 UTCGHSA enrichment
  21. 2026-07-27 14:14 UTCEPSS rescore
  22. 2026-07-27 10:41 UTCEG score recompute
  23. 2026-07-27 10:41 UTCGHSA enrichment
  24. 2026-07-26 14:54 UTCEPSS rescore
  25. 2026-07-26 14:54 UTCEPSS rescore
Show 28 more
  1. 2026-07-26 11:54 UTCEG score recompute
  2. 2026-07-26 11:54 UTCGHSA enrichment
  3. 2026-07-25 14:18 UTCEPSS rescore
  4. 2026-07-25 14:18 UTCEPSS rescore
  5. 2026-07-24 14:18 UTCEPSS rescore
  6. 2026-07-24 14:18 UTCEPSS rescore
  7. 2026-07-23 14:18 UTCEPSS rescore
  8. 2026-07-23 14:18 UTCEPSS rescore
  9. 2026-07-23 03:21 UTCEG score recompute
  10. 2026-07-22 14:08 UTCEPSS rescore
  11. 2026-07-22 14:08 UTCEPSS rescore
  12. 2026-07-21 15:25 UTCEPSS rescore
  13. 2026-07-21 15:25 UTCEPSS rescore
  14. 2026-07-20 17:08 UTCEPSS rescore
  15. 2026-07-19 14:31 UTCEPSS rescore
  16. 2026-07-19 02:29 UTCEPSS rescore
  17. 2026-07-17 05:06 UTCGHSA enrichment
  18. 2026-07-16 17:03 UTCEPSS rescore
  19. 2026-07-16 06:19 UTCGHSA enrichment
  20. 2026-07-15 16:57 UTCEPSS rescore
  21. 2026-07-15 16:57 UTCEPSS rescore
  22. 2026-07-15 07:29 UTCGHSA enrichment
  23. 2026-07-15 02:00 UTCEPSS rescore
  24. 2026-07-15 02:00 UTCEPSS rescore
  25. 2026-07-14 08:41 UTCGHSA enrichment
  26. 2026-07-13 22:31 UTCEPSS rescore
  27. 2026-07-13 09:54 UTCEG score recompute
  28. 2026-07-13 09:52 UTCMITRE cvelistV5first tracked

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 94.9% 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

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