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CVE-2026-5430: Authentication Bypass via JWT Algorithm Mismatch in Multiple WSO2 Products Allows Account Takeover

Critical · CVSS 10.0 (CVSS 3.1)KEV known exploitedEPSS 22.4%, 98th percentilePublished Updated Assigner: WSO2

In CISA’s Known Exploited Vulnerabilities catalog: WSO2 Multiple Products Path Traversal Vulnerability .

Added , federal remediation due . Known ransomware use: Unknown.

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.

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.

Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H · CWE-347

Status incidents that name it

No tracked status incident names this CVE.

Affected vendors and products

WSO2: WSO2 API Control PlaneWSO2: WSO2 API ManagerWSO2: WSO2 Carbon API Manager Rest API UtilityWSO2: WSO2 Traffic ManagerWSO2: WSO2 Universal Gateway

References

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