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CVE-2026-5430

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 w…

Scores

10.0
CVSS 10.0 out of 10, critical severity.
0.6%
EPSS 0.6% chance of exploitation in the next 30 days.

The facts

Published
6 August 2026
Last changed
25 September 2026
NVD status
Analyzed
Severity
Critical, CVSS 10.0 out of 10 (version 3.1)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Weakness
Affects
  • wso2 api control plane
  • wso2 api manager
  • wso2 traffic manager
  • wso2 universal gateway
Known exploited
Yes. CISA added it to the Known Exploited Vulnerabilities catalogue on 24 September 2026.
EPSS
0.6% chance of exploitation activity in the next 30 days (percentile 47).

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References