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

WSO2 · CVE-2026-5430
0 news outlets0 CERTs and agencies0 researchers

What is it?

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.

Evidence

No coverage recorded yet.

Exploitation

  • Public proof of concept
  • Exploited in the wild
  • Listed as known exploited
CVSS
10.0
EPSS
0.6%
First seen
4 h ago
Status
confirmed

All WSO2 vulnerabilities