CVE-2026-5430

Authentication Bypass via JWT Algorithm Mismatch in Multiple WSO2 Products Allows Account Takeover

CVSS 10 critical · WSO2 WSO2 Universal Gateway · published 2026-08-06

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.

NVD · CVE.org

Coverage 1 source

1. 2026-09-24 CISA Cybersecurity Advisories high CISA Adds Two Known Exploited Vulnerabilities to Catalog

   CISA added two vulnerabilities to its Known Exploited Vulnerabilities Catalog: CVE-2026-5430 and CVE-2026-71362.

Mentioned with

CVE-2026-71362

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