CVE-2026-5430
Authentication Bypass via JWT Algorithm Mismatch in Multiple WSO2 Products Allows Account Takeover
KEVCRITICAL 10.0EPSS 0.6%
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.
- Affected
- WSO2 · WSO2 Universal Gateway · WSO2 Traffic Manager · WSO2 API Control Plane · WSO2 API Manager · WSO2 Carbon API Manager Rest API Utility
- CVSS v3.1 CNA
- 10.0 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H - EPSS
- 0.59% chance of exploitation in the next 30 days, 47th percentile
- CISA KEV
- added 2026-09-24
- Published
- 2026-08-06
- Updated
- 2026-09-25
Proof-of-concept exploits (3)
- abraxas/CVE-2026-54301★ · 2026-10-07
- davidvrns/CVE-2026-5430-WSO20★ · 2026-10-08
- getdrive/wso2_cve-2026-5430_lab0★ · 2026-10-08