CVSS 3.1
10.0 criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:HCVE-2026-5430
Critical (10.0) in WSO2 Multiple Products. In CISA KEV since 2026-09-24. EPSS 22% chance of exploitation in the next 30 days.
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.
Severity
- EPSS
- 22% chance of exploitation in the next 30 days; higher than 97% of CVEs (scores of 2026-10-31)
- CISA KEV
- listed 2026-09-24, due 2026-09-27
- CWE
- CWE-347
- Published
- Modified
- Record from
- the NVD, synced
Affected
- wso2:api_control_plane
- wso2:api_manager
- wso2:traffic_manager
- wso2:universal_gateway