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TI-2026-04755 Aliases CVE-2026-5430GHSA-j7vh-5w8q-4m4x

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

Priority CRITICAL 100Exploited in the wildCWE-347Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-347.

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.

Why it matters now

Exploitation Active In CISA KEV since 2026-09-24CISA due date 2026-09-27
EPSS 0.2239 97th percentileScored 2026-11-07
Fix Fixed WSO2 Universal Gateway (WSO2): 4.5.0.57, 4.6.0.21WSO2 Traffic Manager (WSO2): 4.5.0.56, 4.6.0.21+3 more products

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Active
Automatable
Yes
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
WSO2WSO2 Universal Gateway4.5.0 to before 4.5.0.57; 4.6.0 to before 4.6.0.214.5.0.57, 4.6.0.21Patch availableCNA
WSO2WSO2 Traffic Manager4.5.0 to before 4.5.0.56; 4.6.0 to before 4.6.0.214.5.0.56, 4.6.0.21Patch availableCNA
WSO2WSO2 API Control Plane4.5.0 to before 4.5.0.58; 4.6.0 to before 4.6.0.224.5.0.58, 4.6.0.22Patch availableCNA
WSO2WSO2 API Manager4.1.0 to before 4.1.0.257; 4.2.0 to before 4.2.0.197; 4.3.0 to before 4.3.0.108; 4.4.0 to before 4.4.0.72; 4.5.0 to before 4.5.0.57; 4.6.0 to before 4.6.0.214.1.0.257, 4.2.0.197, 4.3.0.108, 4.4.0.72, 4.5.0.57, 4.6.0.21Patch availableCNA
WSO2WSO2 Carbon API Manager Rest API Utility9.20.74 to before 9.20.74.401; 9.28.116 to before 9.28.116.417; 9.29.120 to before 9.29.120.236; 9.30.67 to before 9.30.67.167; 9.31.86 to before 9.31.86.158; 9.32.147 to before 9.32.147.599.20.74.401, 9.28.116.417, 9.29.120.236, 9.30.67.167, 9.31.86.158, 9.32.147.59, 9.33.106Patch availableCNA
  • WSO2 Universal Gateway VendorWSO2 Affected 4.5.0 to before 4.5.0.57; 4.6.0 to before 4.6.0.21 Fixed in 4.5.0.57, 4.6.0.21 Patch available CNA
  • WSO2 Traffic Manager VendorWSO2 Affected 4.5.0 to before 4.5.0.56; 4.6.0 to before 4.6.0.21 Fixed in 4.5.0.56, 4.6.0.21 Patch available CNA
  • WSO2 API Control Plane VendorWSO2 Affected 4.5.0 to before 4.5.0.58; 4.6.0 to before 4.6.0.22 Fixed in 4.5.0.58, 4.6.0.22 Patch available CNA
  • WSO2 API Manager VendorWSO2 Affected 4.1.0 to before 4.1.0.257; 4.2.0 to before 4.2.0.197; 4.3.0 to before 4.3.0.108; 4.4.0 to before 4.4.0.72; 4.5.0 to before 4.5.0.57; 4.6.0 to before 4.6.0.21 Fixed in 4.1.0.257, 4.2.0.197, 4.3.0.108, 4.4.0.72, 4.5.0.57, 4.6.0.21 Patch available CNA
  • WSO2 Carbon API Manager Rest API Utility VendorWSO2 Affected 9.20.74 to before 9.20.74.401; 9.28.116 to before 9.28.116.417; 9.29.120 to before 9.29.120.236; 9.30.67 to before 9.30.67.167; 9.31.86 to before 9.31.86.158; 9.32.147 to before 9.32.147.59 Fixed in 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 Patch available CNA

CPE configurations NVD · 4

CPEVersionsRoleVendor
cpe:2.3:a:wso2:api_control_plane:*:*:*:*:*:*:*:*4.5.0 to before 4.5.0.58; 4.6.0 to before 4.6.0.22VulnerableWSO2
cpe:2.3:a:wso2:api_manager:*:*:*:*:*:*:*:*4.1.0 to before 4.1.0.257; 4.2.0 to before 4.2.0.197; 4.3.0 to before 4.3.0.108; 4.4.0 to before 4.4.0.72; 4.5.0 to before 4.5.0.57; 4.6.0 to before 4.6.0.21VulnerableWSO2
cpe:2.3:a:wso2:traffic_manager:*:*:*:*:*:*:*:*4.5.0 to before 4.5.0.56; 4.6.0 to before 4.6.0.21VulnerableWSO2
cpe:2.3:a:wso2:universal_gateway:*:*:*:*:*:*:*:*4.5.0 to before 4.5.0.57; 4.6.0 to before 4.6.0.21VulnerableWSO2
  • cpe:2.3:a:wso2:api_control_plane:*:*:*:*:*:*:*:* Versions 4.5.0 to before 4.5.0.58; 4.6.0 to before 4.6.0.22 Vulnerable ·WSO2
  • cpe:2.3:a:wso2:api_manager:*:*:*:*:*:*:*:* Versions 4.1.0 to before 4.1.0.257; 4.2.0 to before 4.2.0.197; 4.3.0 to before 4.3.0.108; 4.4.0 to before 4.4.0.72; 4.5.0 to before 4.5.0.57; 4.6.0 to before 4.6.0.21 Vulnerable ·WSO2
  • cpe:2.3:a:wso2:traffic_manager:*:*:*:*:*:*:*:* Versions 4.5.0 to before 4.5.0.56; 4.6.0 to before 4.6.0.21 Vulnerable ·WSO2
  • cpe:2.3:a:wso2:universal_gateway:*:*:*:*:*:*:*:* Versions 4.5.0 to before 4.5.0.57; 4.6.0 to before 4.6.0.21 Vulnerable ·WSO2

Remediation

  • Fix · CNA WSO2 Universal Gateway (WSO2) Fixed in 4.5.0.57, 4.6.0.21
  • Fix · CNA WSO2 Traffic Manager (WSO2) Fixed in 4.5.0.56, 4.6.0.21
  • Fix · CNA WSO2 API Control Plane (WSO2) Fixed in 4.5.0.58, 4.6.0.22
  • Fix · CNA WSO2 API Manager (WSO2) Fixed in 4.1.0.257, 4.2.0.197, 4.3.0.108, 4.4.0.72, 4.5.0.57, 4.6.0.21
  • Fix · CNA WSO2 Carbon API Manager Rest API Utility (WSO2) Fixed in 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. 2026-09-24 Added to CISA KEV
  2. 2026-10-02 Threatist record created from CVE-2026-5430
  3. 2026-10-03 Alias added: GHSA-j7vh-5w8q-4m4x
  4. 2026-10-25 EPSS moved to the 95th–99th percentile

References

Advisory 1

  • TI-2025-13722 Account Takeover via Conditional Authentication Script Logic in Multiple WSO2 Products CVSS 3.1CRITICAL 9.4
  • TI-2025-09712 Potential Broken Access Control in Multiple WSO2 Products via System REST APIs CVSS 3.1CRITICAL 9.8
  • TI-2025-08391 Improper Privilege Management in Multiple WSO2 API Manager via keymanager-operations DCR Endpoint CVSS 3.1CRITICAL 9.8
  • TI-2026-01411 Privilege Escalation via System REST APIs in Multiple WSO2 Products Permits Admin Account Takeover CVSS 3.1CRITICAL 9.8
  • TI-2025-08536 Improper Certificate-Based Authentication Enforcement in Multiple WSO2 Products CVSS 3.1CRITICAL 9.8
  • TI-2026-03696 Denial of Service via Malicious JSON Payloads in Throttling Events in Multiple WSO2… CVSS 3.1HIGH 8.6
See all 30 →

Sources

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