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CVE-2026-5430

Severity
CRITICAL
CVSS
10.0
EPSS
0.00223
Risk score
40.08
CISA KEV
No
PoC
No
Published
2026-08-06
Modified
2026-08-06
First seen
2026-08-07
Aliases
EUVD-2026-53822, GHSA-J7VH-5W8Q-4M4X
Products
WSO2:WSO2 API Control Plane 4.5.0 <4.5.0.58, WSO2:WSO2 API Control Plane 4.6.0 <4.6.0.22, WSO2:WSO2 API Manager 4.1.0 <4.1.0.257, WSO2:WSO2 API Manager 4.2.0 <4.2.0.197, WSO2:WSO2 API Manager 4.3.0 <4.3.0.108, WSO2:WSO2 API Manager 4.4.0 <4.4.0.72, WSO2:WSO2 API Manager 4.5.0 <4.5.0.57, WSO2:WSO2 API Manager 4.6.0 <4.6.0.21, WSO2:WSO2 Carbon API Manager Rest API Utility 9.20.74 <9.20.74.401, WSO2:WSO2 Carbon API Manager Rest API Utility 9.28.116 <9.28.116.417, WSO2:WSO2 Carbon API Manager Rest API Utility 9.29.120 <9.29.120.236, WSO2:WSO2 Carbon API Manager Rest API Utility 9.30.67 <9.30.67.167, WSO2:WSO2 Carbon API Manager Rest API Utility 9.31.86 <9.31.86.158, WSO2:WSO2 Carbon API Manager Rest API Utility 9.32.147 <9.32.147.59, WSO2:WSO2 Traffic Manager 4.5.0 <4.5.0.56, WSO2:WSO2 Traffic Manager 4.6.0 <4.6.0.21, WSO2:WSO2 Universal Gateway 4.5.0 <4.5.0.57, WSO2:WSO2 Universal Gateway 4.6.0 <4.6.0.21, wso2:api_control_plane, wso2:api_manager, wso2:traffic_manager, wso2:universal_gateway
Sources
euvd EUVD-2026-53822
nvd CVE-2026-5430

Description

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.

References