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.
CVSS breakdown
CVSS 3.1
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High
Affected products
- WSO2 / api_control_plane4.5.0 – 4.5.0.58
- WSO2 / api_manager4.1.0 – 4.1.0.257
- WSO2 / traffic_manager4.5.0 – 4.5.0.56
- WSO2 / universal_gateway4.5.0 – 4.5.0.57
- WSO2 / WSO2 API Control Plane4.5.0 – 4.5.0.58
- WSO2 / WSO2 API Control Plane4.6.0 – 4.6.0.22
- WSO2 / WSO2 API Manager4.5.0 – 4.5.0.57
- WSO2 / WSO2 API Manager4.6.0 – 4.6.0.21
- WSO2 / WSO2 API Manager0 – 4.1.0
- WSO2 / WSO2 API Manager4.1.0 – 4.1.0.257
- WSO2 / WSO2 API Manager4.2.0 – 4.2.0.197
- WSO2 / WSO2 API Manager4.3.0 – 4.3.0.108
- WSO2 / WSO2 API Manager4.4.0 – 4.4.0.72
- WSO2 / WSO2 Carbon API Manager Rest API Utility9.20.74 – 9.20.74.401
- WSO2 / WSO2 Carbon API Manager Rest API Utility9.28.116 – 9.28.116.417
- WSO2 / WSO2 Carbon API Manager Rest API Utility9.29.120 – 9.29.120.236
- WSO2 / WSO2 Carbon API Manager Rest API Utility9.30.67 – 9.30.67.167
- WSO2 / WSO2 Carbon API Manager Rest API Utility9.31.86 – 9.31.86.158
- WSO2 / WSO2 Carbon API Manager Rest API Utility9.32.147 – 9.32.147.59
- WSO2 / WSO2 Carbon API Manager Rest API Utility9.33.106 – *
- WSO2 / WSO2 Traffic Manager4.6.0 – 4.6.0.21
- WSO2 / WSO2 Traffic Manager4.5.0 – 4.5.0.56
- WSO2 / WSO2 Universal Gateway4.5.0 – 4.5.0.57
- WSO2 / WSO2 Universal Gateway4.6.0 – 4.6.0.21
News coverage
- CISA warns of Sharepoint, WSO2, Adobe Commerce flaws exploited in attacksBleepingComputer · 9/25/2026
- WSO2 and Adobe Commerce Flaws Exploited in Attacks, Added to CISA KEVThe Hacker News · 9/25/2026
- Active Exploitation Attempts Target WSO2 API Manager JWT Bypass With Forged Admin TokensThe Hacker News · 9/16/2026
Updated 22m ago · 8 sources