Quantum Secular Labs / Blog / Advisories

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

CVE-2026-5430 is rated critical with a CVSS v3.1 base score of 10.0 and affects WSO2 Multiple Products, along with 4 other products in NVD’s configuration data. Per its scoring, it can be exploited over the network, without authentication, without any user interaction. The scored impact on confidentiality, integrity and availability is the highest available. CISA added it to its Known Exploited Vulnerabilities catalog on 2026-09-24, which means exploitation in the wild has been observed.

Vulnerability 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.

Severity breakdown

CVSS v3.1 10.0: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

  • Attack vector: Network. Exploitable remotely over the network, with no need for local or physical access.
  • Attack complexity: Low. No special conditions; the attack can be repeated reliably.
  • Privileges required: None. No account or prior access is needed.
  • User interaction: None. No action from any user is needed.
  • Scope: Changed. Impact reaches beyond the vulnerable component to other resources.
  • Confidentiality impact: High. Total loss of confidentiality; sensitive data can be fully disclosed.
  • Integrity impact: High. Total loss of integrity; data or system state can be fully modified.
  • Availability impact: High. Total loss of availability; the component can be shut down.

Underlying weakness

CWE-347: Improper Verification of Cryptographic Signature

The product does not verify, or incorrectly verifies, the cryptographic signature for data.

Affected products

  • Wso2 API Control Plane: from 4.5.0 before 4.5.0.58; from 4.6.0 before 4.6.0.22
  • Wso2 API Manager: from 4.1.0 before 4.1.0.257; from 4.2.0 before 4.2.0.197; from 4.3.0 before 4.3.0.108; from 4.4.0 before 4.4.0.72; from 4.5.0 before 4.5.0.57; from 4.6.0 before 4.6.0.21
  • Wso2 Traffic Manager: from 4.5.0 before 4.5.0.56; from 4.6.0 before 4.6.0.21
  • Wso2 Universal Gateway: from 4.5.0 before 4.5.0.57; from 4.6.0 before 4.6.0.21

References