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CVE-2026-5430

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

Description (CNA)

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 (CNA)

Vendor / productVersions
WSO2 / WSO2 Universal Gatewayaffected 4.5.0 before 4.5.0.57; affected 4.6.0 before 4.6.0.21
WSO2 / WSO2 Traffic Manageraffected 4.5.0 before 4.5.0.56; affected 4.6.0 before 4.6.0.21
WSO2 / WSO2 API Control Planeaffected 4.5.0 before 4.5.0.58; affected 4.6.0 before 4.6.0.22
WSO2 / WSO2 API Managerunknown 0 before 4.1.0; affected 4.1.0 before 4.1.0.257; affected 4.2.0 before 4.2.0.197; affected 4.3.0 before 4.3.0.108; affected 4.4.0 before 4.4.0.72; affected 4.5.0 before 4.5.0.57; affected 4.6.0 before 4.6.0.21
WSO2 / WSO2 Carbon API Manager Rest API Utilityaffected 9.20.74 before 9.20.74.401; affected 9.28.116 before 9.28.116.417; affected 9.29.120 before 9.29.120.236; affected 9.30.67 before 9.30.67.167; affected 9.31.86 before 9.31.86.158; affected 9.32.147 before 9.32.147.59; unaffected 9.33.106 through *

CWE

CWE-347

References

ADP enrichment

CISA-ADP

No English description supplied.