CVE-2026-36721

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-06-09. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.8Exploit: NoneExposed: 0

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

A lack of cryptographic signature verification in the validateAccessToken function of bookcars v8.3 allows attackers to bypass authentication via a forged JWT token.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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
Severity98% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
18.8%
KEV
Not listed

Published

June 9, 2026

Last Modified

July 23, 2026

Advisory Details (1)

Auto-updated Jun 20, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

Vulnerabilities/bookcars/vulnerability-2 at master · CC-T-454455/Vulnerabilities · GitHub

https://github.com/CC-T-454455/Vulnerabilities/tree/master/bookcars/vulnerability-2

Vendor Advisories for CVE-2026-36721(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 / 136× 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 220 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-36721?
CVE-2026-36721 is a critical vulnerability published on June 9, 2026. A lack of cryptographic signature verification in the validateAccessToken function of bookcars v8.3 allows attackers to bypass authentication via a forged JWT token.
When was CVE-2026-36721 disclosed?
CVE-2026-36721 was first published in the National Vulnerability Database on June 9, 2026, with the most recent update on July 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-36721 actively exploited?
CVE-2026-36721 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-2026-36721?
CVE-2026-36721 has a CVSS v3.1 base score of 9.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-36721?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-36721, 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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