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Fencer Vulns
critical 10.0

CVE-2026-5430 kev in the critical feed json

Authentication Bypass via JWT Algorithm Mismatch in Multiple WSO2 Products Allows Account Takeover

published 2026-08-06 3 mo ago modified 2026-09-25 44 d ago also EUVD-2026-53822

cvss
10.0
version 3.1, CNA
cisa kev
Exploited
added 2026-09-24
epss
22.4%
EPSS 22.4% chance of exploitation in 30 days, percentile 97%
public exploits
0
none known

Summary

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.

Patch / fix

cisa required action Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

  • WSO2 WSO2 Universal Gateway 4.5.0.57, 4.6.0.21
  • WSO2 WSO2 Traffic Manager 4.5.0.56, 4.6.0.21
  • WSO2 WSO2 API Control Plane 4.5.0.58, 4.6.0.22
  • WSO2 WSO2 API Manager 4.1.0.257, 4.2.0.197, 4.3.0.108, 4.4.0.72, 4.5.0.57, 4.6.0.21
  • WSO2 WSO2 Carbon API Manager Rest API Utility 9.20.74.401, 9.28.116.417, 9.29.120.236, 9.30.67.167, 9.31.86.158, 9.32.147.59, 9.33.106

Timeline

  1. Published
  2. CISA SSVC: exploitation active
  3. Added to CISA KEV
  4. CISA patch deadline

Known exploited

Added
46 d ago
Patch by
2026-09-27 (43 d ago)
Ransomware
Not known
Required action
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Vendor, product
WSO2, Multiple Products
CISA name
WSO2 Multiple Products Path Traversal Vulnerability

CISA SSVC

Exploitation
Active, exploited in the wild
Automatable
yes
Technical impact
total
Assessed
46 d ago

Exploit prediction

22.39% chance of exploitation in the next 30 days, higher than 97% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 10.0 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Affected products

  • WSO2 WSO2 Universal Gateway
  • WSO2 WSO2 Traffic Manager
  • WSO2 WSO2 API Control Plane
  • WSO2 WSO2 API Manager
  • WSO2 WSO2 Carbon API Manager Rest API Utility

Classification

Weakness
  • CWE-347 Improper Verification of Cryptographic Signature

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.