JWT Authentication Vulnerability in WSO2 Products
CVE-2026-5430

10CRITICAL

Key Information:

Vendor

Wso2

Status
Wso2 Universal Gateway
Wso2 Traffic Manager
Wso2 Api Control Plane
Wso2 Api Manager
Vendor
CVE Published:
6 August 2026

Badges

📈 Trended📈 Score: 2,690👾 Exploit Exists🟡 Public PoC🦅 CISA Reported📰 News Worthy

What is CVE-2026-5430?

CVE-2026-5430 is a critical vulnerability found in WSO2 products that centers around the JSON Web Token (JWT) authentication mechanism. This mechanism is designed to verify the authenticity of tokens used for user authentication in various applications built on the WSO2 platform. The vulnerability arises because the JWT authentication system permits the acceptance of tokens signed using unsupported algorithms. Attackers can exploit this flaw by crafting a JWT with a maliciously selected algorithm, which the system may incorrectly validate as legitimate. This misconfiguration can lead to unauthorized access to sensitive systems, potentially allowing attackers to compromise administrative accounts or take over user accounts entirely.

With a CVSS score of 9.8, this vulnerability presents a high risk, especially in single-tenant deployments, where the impact is theoretically confined to a single security authority boundary. Organizations using WSO2 products need to be aware of this vulnerability, as its exploitation could disrupt operations and lead to significant data breaches.

Potential Impact of CVE-2026-5430

  1. Unauthorized Access: The most immediate and severe consequence of this vulnerability is the ability for attackers to gain unauthorized access to systems. Successful exploitation may allow threat actors to manipulate systems as if they were legitimate users, potentially compromising sensitive data and operations.

  2. Compromise of Administrative Accounts: Attackers could leverage this vulnerability to gain control over administrative accounts, which would give them the ability to reconfigure security settings, access critical infrastructure, and create additional attack vectors within the organization.

  3. Full Account Takeover: The nature of the vulnerability enables attackers to potentially hijack user accounts completely. This could lead to widespread phishing campaigns, identity theft, or further internal exploits, amplifying the impact across the organizational landscape.

CISA has reported CVE-2026-5430

CISA provides regional cyber and physical services to support security and resilience across the United States. CISA monitor the most dangerious vulnerabilities and have identifed CVE-2026-5430 as being exploited but is not known by the CISA to be used in ransomware campaigns. This is subject to change at pace

The CISA's recommendation is: 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.

Affected Version(s)

WSO2 API Control Plane 4.5.0 < 4.5.0.58

WSO2 API Control Plane 4.6.0 < 4.6.0.22

WSO2 API Manager 4.1.0 < 4.1.0.257

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-5430
Created by HORKimhab

News Articles

favicon imageBleepingComputer

CISA warns of Sharepoint, WSO2, Adobe Commerce flaws exploited in attacks

The Cybersecurity and Infrastructure Security Agency (CISA) warns that hackers are exploiting a critical authentication bypass vulnerability (CVE-2026-5430) affecting multiple products from enterprise software provider WSO2.

17 hours ago

favicon imageSecurityweek

Enterprises Warned of Attacks Exploiting WSO2 Vulnerability

A critical WSO2 vulnerability tracked as CVE-2026-5430 has been exploited in the wild to gain access to sensitive enterprise data.

1 week ago

References

https://security.docs.wso2.com/en/latest/security-announc...
vendor-advisory

CVSS V3.1

Score:
10
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Changed

Timeline

  • 🦅

    CISA Reported

  • 📈

    Vulnerability started trending

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • 📰

    First article discovered by Securityweek

  • Vulnerability published

  • Vulnerability Reserved

Credit

hacktron.ai
.