CVE-2026-5430

Published Aug 6, 2026

Last updated 9 days ago

Exploit known CVSS critical 10.0

Jwt

Cloud

Server

Overview

AI description

Automated description summarized from trusted sources.

CVE-2026-5430 is a signature verification vulnerability affecting WSO2 API management products, including API Control Plane, API Manager, Traffic Manager, and Universal Gateway. This flaw stems from the way these products handle JSON Web Token (JWT) authentication, specifically by accepting tokens signed with algorithms that are not explicitly configured or supported. An attacker can exploit this vulnerability by crafting a JWT signed with an unsupported algorithm, which the affected WSO2 products incorrectly validate as legitimate. This bypasses authentication mechanisms, potentially granting unauthorized access to the system, including administrative accounts.

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.
Source: ed10eef1-636d-4fbe-9993-6890dfa878f8
NVD status: Analyzed
Products: api_control_plane, api_manager, traffic_manager, universal_gateway

Risk scores

CVSS 3.1

Type: Secondary
Base score: 10
Impact score: 6
Exploitability score: 3.9
Vector string: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Severity: CRITICAL

Known exploits

Data from CISA

Vulnerability name: WSO2 Multiple Products Path Traversal Vulnerability
Exploit added on: Sep 24, 2026
Exploit action due: Sep 27, 2026
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.

Weaknesses

ed10eef1-636d-4fbe-9993-6890dfa878f8: CWE-347

Hype score: Not currently trending

Configurations

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References

Sources include official advisories and independent security research.