CVE-2026-5430
Authentication Bypass via JWT Algorithm Mismatch in Multiple WSO2 Products Allows Account Takeover
WSO2 Multiple Products Path Traversal Vulnerability is confirmed as actively exploited and is listed in the CISA KEV catalog.
Required action
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
CISA notes
https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2026-5328/ ; ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-5430
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.
Severity
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:HAffected Products
| Vendor | Product | Affected versions |
|---|---|---|
| WSO2 | WSO2 Universal Gateway | 4.5.0 to <4.5.0.57 4.6.0 to <4.6.0.21 |
| WSO2 | WSO2 Traffic Manager | 4.5.0 to <4.5.0.56 4.6.0 to <4.6.0.21 |
| WSO2 | WSO2 API Control Plane | 4.5.0 to <4.5.0.58 4.6.0 to <4.6.0.22 |
| WSO2 | WSO2 API Manager | 0 to <4.1.0 (unknown) 4.1.0 to <4.1.0.257 4.2.0 to <4.2.0.197 4.3.0 to <4.3.0.108 4.4.0 to <4.4.0.72 4.5.0 to <4.5.0.57 4.6.0 to <4.6.0.21 |
| WSO2 | WSO2 Carbon API Manager Rest API Utility | 9.20.74 to <9.20.74.401 9.28.116 to <9.28.116.417 9.29.120 to <9.29.120.236 9.30.67 to <9.30.67.167 9.31.86 to <9.31.86.158 9.32.147 to <9.32.147.59 9.33.106 to * (unaffected) |
References
1 LinksRecord Details
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Tool categories that test for or protect against this vulnerability class.
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