CVE-2026-39999

CRITICALNVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

Score 9.1 from GitHub Security Advisory (severity: HIGH) published 2026-06-19. NVD baseline CVSS 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.1Exploit: None knownExposed: 0

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

Authentication Bypass by Spoofing vulnerability in Apache APISIX.

The attacker can completely bypass authentication capitalising on certain configurations of jwt-auth plugin. This issue affects Apache APISIX: from v2.2 through v3.16.0.

Users are recommended to upgrade to version v3.17.0, which fixes the issue.

CVSS v3
9.1
EG Score
9.1(medium)
EG Risk
46(Track)
EG Risk 46/100SSVC: 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
Severity91% × 45%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
48%
KEV
Not listed

Published

June 19, 2026

Last Modified

June 23, 2026

Advisory Details (2)

Auto-updated Sep 8, 2026
No patch confirmed yet.
generic

oss-security - CVE-2026-39999: Apache APISIX: JWT Algorithm Confusion allows authentication bypass

http://www.openwall.com/lists/oss-security/2026/06/19/5
generic
https://lists.apache.org/thread/nfopt8cnxd3k0rs1oxtr7lzxrdw4mojq

Vendor Advisories for CVE-2026-39999(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 6× in last 7d / 95× 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 427 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-39999?
CVE-2026-39999 is a critical vulnerability published on June 19, 2026. Authentication Bypass by Spoofing vulnerability in Apache APISIX. The attacker can completely bypass authentication capitalising on certain configurations of jwt-auth plugin. This issue affects Apache APISIX: from v2.2 through v3.16.0. Users are recommended to upgrade to version v3.17.0, which…
When was CVE-2026-39999 disclosed?
CVE-2026-39999 was first published in the National Vulnerability Database on June 19, 2026, with the most recent update on June 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-39999 actively exploited?
CVE-2026-39999 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 51.6% of all scored CVEs.
What is the CVSS score of CVE-2026-39999?
CVE-2026-39999 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2026-39999?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-39999, 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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