CVE-2026-5430

CRITICALPre-NVD 10.010.0—
EchelonGraph scoreHIGH confidence

Score elevated to 10.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2026-09-24), indicating real-world exploitation has been confirmed by US federal agencies. A secondary CVSS source baseline 10.0 retained for reference (NVD's own analysis pending). Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, secondary
Trending — KEV-added this weekExploited in the wild
10.0EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 0.6%CVSS: 10.0Exploit: cisa kev · ssvc activeExposed services: Not assessed

A fix is available — apply it.

The JWT authentication mechanism accepts tokens signed with algorithms other than those explicitly configured or supported. This allows an attacker to craft a JWT with an unsupported algorithm, which is then incorrectly validated, leading to unauthorized access.

Successful exploitation of this vulnerability may result in unauthorized access to the system, including the potential compromise of administrative accounts and full account takeover. The CVSS score is adjusted to 9.8 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H) in single-tenant deployments, reflecting that the impact is contained within a single security authority boundary.

CVSS v3
10.0
EG Score
10.0CRITICALhigh confidence
EG Risk
100
EG Risk 100/100CISA SSVC

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
Severity100% × 45%
Exploitation100% × 40%
Automatability100% × 15%
CISA SSVC: Attend at low mission impact; Act at medium or high.
Action: A fix is available. Apply it sooner than your standard update timelines at low mission impact and as soon as possible at medium or high.
EPSS PROB
0.6%
EPSS %ILE
46th
KEV
⚠ Exploited

CISA SSVCAttend at low mission impact; Act at medium or high.

A fix is available. Apply it sooner than your standard update timelines at low mission impact and as soon as possible at medium or high.

Exploitation active (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 6, 2026

Last Modified

September 25, 2026

Advisory Details (2)

Auto-updated Oct 2, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: cisa.
cisa Patch Available🔴 Active Exploitation

Known Exploited Vulnerabilities Catalog | CISA

Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-5430
generic

Security Advisory WSO2-2026-5328/CVE-2026-5430 - WSO2 Security and Compliance Documentation

https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2026-5328/

Vendor Advisories for CVE-2026-5430(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 55× in last 7d / 210× 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 430 total refreshes for this CVE.

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

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Frequently asked(6)

What is CVE-2026-5430?
CVE-2026-5430 is a critical vulnerability published on August 6, 2026. The JWT authentication mechanism accepts tokens signed with algorithms other than those explicitly configured or supported. This allows an attacker to craft a JWT with an unsupported algorithm, which is then incorrectly validated, leading to unauthorized access. Successful exploitation of this…
When was CVE-2026-5430 disclosed?
CVE-2026-5430 was first published on August 6, 2026, with the most recent update on September 25, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-5430 actively exploited?
Yes. CISA added CVE-2026-5430 to the Known Exploited Vulnerabilities catalog on September 24, 2026, affecting WSO2 Multiple Products. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate attention. A fix is available. Apply it.
What is the CVSS score of CVE-2026-5430?
CVE-2026-5430 has a CVSS base score of 10.0 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
Which products are affected by CVE-2026-5430?
CVE-2026-5430 affects WSO2 Multiple Products.
How do I remediate CVE-2026-5430?
A fix for CVE-2026-5430 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-5430 are linked in the Vendor Advisories panel on this page.

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