Security Advisory WSO2-2026-5328/CVE-2026-5430

Published: 2026-05-03

Version: 1.0.0

Severity: Critical

CVSS Score: 10 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H)

CVE IDs: CVE-2026-5430

AFFECTED PRODUCTS

  • WSO2 API Control Plane: 4.6.0, 4.5.0
  • WSO2 API Manager: 4.6.0, 4.5.0, 4.4.0, 4.3.0, 4.2.0, 4.1.0
  • WSO2 Traffic Manager: 4.6.0, 4.5.0
  • WSO2 Universal Gateway: 4.6.0, 4.5.0

OVERVIEW

Account takeover via authentication bypass vulnerability.

DESCRIPTION

JWT authentication can be bypassed when a token is signed using an unsupported algorithm, allowing unauthorized access.

IMPACT

Successful exploitation of the vulnerability may lead to unauthorized access, including 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. This adjustment reflects that the impact is contained within a single security authority boundary.

SOLUTION

Community Users (Open Source)

Apply the relevant fixes to your product using the public fix(es) provided below.

If applying the fix or update is not feasible, migrate to the latest unaffected version of the respective WSO2 product(s).

Support Subscription Holders

Update your product to the specified update level, or to a higher update level, to mitigate the identified vulnerability.

Info

WSO2 Support Subscription Holders may use WSO2 Updates in order to apply the fix.

Product Name Product Version Update Level
WSO2 API Control Plane 4.6.0 22
WSO2 API Control Plane 4.5.0 58
WSO2 API Manager 4.6.0 21
WSO2 API Manager 4.5.0 57
WSO2 API Manager 4.4.0 72
WSO2 API Manager 4.3.0 108
WSO2 API Manager 4.2.0 197
WSO2 API Manager 4.1.0 257
WSO2 Traffic Manager 4.6.0 21
WSO2 Traffic Manager 4.5.0 56
WSO2 Universal Gateway 4.6.0 21
WSO2 Universal Gateway 4.5.0 57

CREDITS

WSO2 thanks, Hacktron Team for responsibly reporting the identified issue and working with us as we addressed it.