CVE-2026-5430

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

Description

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.

Scores

Weaknesses (CWE)

• CWE-347

European references

• ENISA EUVD · EUVD-2026-53822
• GCVE · GCVE-0-2026-5430

Affected configurations (NVD CPE)

• cpe:2.3:a:wso2:api_control_plane:*:*:*:*:*:*:*:* ≥ 4.5.0 < 4.5.0.58
• cpe:2.3:a:wso2:api_control_plane:*:*:*:*:*:*:*:* ≥ 4.6.0 < 4.6.0.22
• cpe:2.3:a:wso2:api_manager:*:*:*:*:*:*:*:* ≥ 4.1.0 < 4.1.0.257
• cpe:2.3:a:wso2:api_manager:*:*:*:*:*:*:*:* ≥ 4.2.0 < 4.2.0.197
• cpe:2.3:a:wso2:api_manager:*:*:*:*:*:*:*:* ≥ 4.3.0 < 4.3.0.108
• cpe:2.3:a:wso2:api_manager:*:*:*:*:*:*:*:* ≥ 4.4.0 < 4.4.0.72
• cpe:2.3:a:wso2:api_manager:*:*:*:*:*:*:*:* ≥ 4.5.0 < 4.5.0.57
• cpe:2.3:a:wso2:api_manager:*:*:*:*:*:*:*:* ≥ 4.6.0 < 4.6.0.21
• cpe:2.3:a:wso2:traffic_manager:*:*:*:*:*:*:*:* ≥ 4.5.0 < 4.5.0.56
• cpe:2.3:a:wso2:traffic_manager:*:*:*:*:*:*:*:* ≥ 4.6.0 < 4.6.0.21
• cpe:2.3:a:wso2:universal_gateway:*:*:*:*:*:*:*:* ≥ 4.5.0 < 4.5.0.57
• cpe:2.3:a:wso2:universal_gateway:*:*:*:*:*:*:*:* ≥ 4.6.0 < 4.6.0.21

Affected products

References

• https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2026-5328/
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-5430

Sources