CVE-2026-5430: WSO2 Multiple Products Path Traversal Vulnerability

Critical severity, CVSS 10.0. Actively exploited: in CISA KEV since 2026-09-24. EPSS: 0.6% 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.

Affected products

• WSO2 API Control Plane: from 4.5.0, before 4.5.0.58 (fixed in 4.5.0.58); from 4.6.0, before 4.6.0.22 (fixed in 4.6.0.22)
• WSO2 API Manager: from 4.1.0, before 4.1.0.257 (fixed in 4.1.0.257); from 4.2.0, before 4.2.0.197 (fixed in 4.2.0.197); from 4.3.0, before 4.3.0.108 (fixed in 4.3.0.108); from 4.4.0, before 4.4.0.72 (fixed in 4.4.0.72); from 4.5.0, before 4.5.0.57 (fixed in 4.5.0.57); from 4.6.0, before 4.6.0.21 (fixed in 4.6.0.21)
• WSO2 Traffic Manager: from 4.5.0, before 4.5.0.56 (fixed in 4.5.0.56); from 4.6.0, before 4.6.0.21 (fixed in 4.6.0.21)
• WSO2 Universal Gateway: from 4.5.0, before 4.5.0.57 (fixed in 4.5.0.57); from 4.6.0, before 4.6.0.21 (fixed in 4.6.0.21)

Published 2026-08-06. Last modified 2026-09-25.