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
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.8Exploit: None knownExposed: 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 PROB
0%
EPSS %ILE
19%
KEV
Not listed

Published

June 9, 2026

Last Modified

July 23, 2026

Advisory Details (1)

Auto-updated Aug 22, 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 24× in last 7d / 166× 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 400 total refreshes for this CVE.

  1. 2026-08-26 14:46 UTCEPSS rescore
  2. 2026-08-25 13:49 UTCEPSS rescore
  3. 2026-08-25 04:43 UTCGHSA enrichment
  4. 2026-08-25 00:48 UTCEG score recompute
  5. 2026-08-25 00:48 UTCGHSA enrichment
  6. 2026-08-23 23:28 UTCGHSA enrichment
  7. 2026-08-23 18:53 UTCGHSA enrichment
  8. 2026-08-23 14:58 UTCGHSA enrichment
  9. 2026-08-23 11:03 UTCEG score recompute
  10. 2026-08-23 11:03 UTCGHSA enrichment
  11. 2026-08-23 00:19 UTCEPSS rescore
  12. 2026-08-21 23:49 UTCEPSS rescore
  13. 2026-08-21 23:36 UTCGHSA enrichment
  14. 2026-08-21 19:42 UTCGHSA enrichment
  15. 2026-08-21 14:43 UTCGHSA enrichment
  16. 2026-08-21 10:48 UTCGHSA enrichment
  17. 2026-08-21 06:38 UTCGHSA enrichment
  18. 2026-08-21 01:14 UTCEG score recompute
  19. 2026-08-21 01:14 UTCGHSA enrichment
  20. 2026-08-20 22:55 UTCEPSS rescore
  21. 2026-08-20 21:19 UTCGHSA enrichment
  22. 2026-08-20 17:25 UTCGHSA enrichment
  23. 2026-08-20 08:57 UTCEG score recompute
  24. 2026-08-20 08:57 UTCGHSA enrichment
  25. 2026-08-19 17:03 UTCEPSS rescore
Show 75 more
  1. 2026-08-19 15:42 UTCEG score recompute
  2. 2026-08-19 15:42 UTCGHSA enrichment
  3. 2026-08-18 13:48 UTCEPSS rescore
  4. 2026-08-17 13:47 UTCEPSS rescore
  5. 2026-08-17 12:32 UTCGHSA enrichment
  6. 2026-08-17 08:07 UTCGHSA enrichment
  7. 2026-08-17 04:12 UTCGHSA enrichment
  8. 2026-08-17 00:17 UTCGHSA enrichment
  9. 2026-08-16 16:01 UTCEG score recompute
  10. 2026-08-16 16:01 UTCGHSA enrichment
  11. 2026-08-16 14:56 UTCEPSS rescore
  12. 2026-08-16 12:06 UTCGHSA enrichment
  13. 2026-08-16 08:12 UTCGHSA enrichment
  14. 2026-08-16 04:18 UTCEG score recompute
  15. 2026-08-16 04:18 UTCGHSA enrichment
  16. 2026-08-16 02:14 UTCEPSS rescore
  17. 2026-08-16 00:24 UTCGHSA enrichment
  18. 2026-08-15 19:14 UTCGHSA enrichment
  19. 2026-08-15 15:15 UTCGHSA enrichment
  20. 2026-08-15 11:21 UTCGHSA enrichment
  21. 2026-08-15 05:58 UTCGHSA enrichment
  22. 2026-08-15 01:44 UTCEG score recompute
  23. 2026-08-15 01:44 UTCGHSA enrichment
  24. 2026-08-15 01:30 UTCEPSS rescore
  25. 2026-08-14 21:50 UTCGHSA enrichment
  26. 2026-08-14 17:56 UTCGHSA enrichment
  27. 2026-08-14 13:57 UTCGHSA enrichment
  28. 2026-08-14 10:03 UTCGHSA enrichment
  29. 2026-08-14 06:09 UTCGHSA enrichment
  30. 2026-08-14 02:14 UTCGHSA enrichment
  31. 2026-08-13 22:20 UTCEG score recompute
  32. 2026-08-13 22:20 UTCGHSA enrichment
  33. 2026-08-13 22:00 UTCEPSS rescore
  34. 2026-08-13 12:16 UTCGHSA enrichment
  35. 2026-08-13 07:55 UTCGHSA enrichment
  36. 2026-08-13 03:25 UTCGHSA enrichment
  37. 2026-08-12 23:31 UTCGHSA enrichment
  38. 2026-08-12 19:37 UTCGHSA enrichment
  39. 2026-08-12 15:43 UTCEG score recompute
  40. 2026-08-12 15:43 UTCGHSA enrichment
  41. 2026-08-12 13:51 UTCEPSS rescore
  42. 2026-08-12 11:32 UTCGHSA enrichment
  43. 2026-08-12 07:37 UTCGHSA enrichment
  44. 2026-08-12 03:32 UTCGHSA enrichment
  45. 2026-08-11 23:36 UTCGHSA enrichment
  46. 2026-08-11 19:42 UTCGHSA enrichment
  47. 2026-08-11 15:48 UTCEG score recompute
  48. 2026-08-11 15:48 UTCGHSA enrichment
  49. 2026-08-11 11:54 UTCGHSA enrichment
  50. 2026-08-11 08:00 UTCGHSA enrichment
  51. 2026-08-11 04:06 UTCGHSA enrichment
  52. 2026-08-11 00:12 UTCEG score recompute
  53. 2026-08-11 00:12 UTCGHSA enrichment
  54. 2026-08-11 00:00 UTCEPSS rescore
  55. 2026-08-10 20:18 UTCGHSA enrichment
  56. 2026-08-10 14:04 UTCGHSA enrichment
  57. 2026-08-10 10:10 UTCGHSA enrichment
  58. 2026-08-10 06:16 UTCGHSA enrichment
  59. 2026-08-10 02:22 UTCGHSA enrichment
  60. 2026-08-09 22:28 UTCGHSA enrichment
  61. 2026-08-09 18:34 UTCGHSA enrichment
  62. 2026-08-09 14:40 UTCEG score recompute
  63. 2026-08-09 14:40 UTCGHSA enrichment
  64. 2026-08-09 13:46 UTCEPSS rescore
  65. 2026-08-09 10:46 UTCGHSA enrichment
  66. 2026-08-09 06:50 UTCGHSA enrichment
  67. 2026-08-09 02:56 UTCGHSA enrichment
  68. 2026-08-08 23:02 UTCGHSA enrichment
  69. 2026-08-08 19:08 UTCEG score recompute
  70. 2026-08-08 19:08 UTCGHSA enrichment
  71. 2026-08-08 16:37 UTCEPSS rescore
  72. 2026-08-08 15:14 UTCGHSA enrichment
  73. 2026-08-08 11:19 UTCGHSA enrichment
  74. 2026-08-08 07:25 UTCGHSA enrichment
  75. 2026-08-08 03:31 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 0% probability of exploitation in the next 30 days, which ranks it in the top 81.4% of all scored CVEs.
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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