CVE-2024-6429 Overview
CVE-2024-6429 is a content spoofing vulnerability affecting multiple WSO2 products, including WSO2 API Manager and WSO2 Identity Server. The flaw stems from improper handling of error messages passed through URL parameters without proper validation. Attackers can inject arbitrary content into browser-displayed error pages by manipulating these parameters. This enables convincing social engineering attacks against users of affected WSO2 deployments. The vulnerability is classified under [CWE-451] (User Interface Misrepresentation of Critical Information) and requires user interaction to exploit.
Critical Impact
Attackers can craft malicious URLs that display attacker-controlled error text within legitimate WSO2 interfaces, enabling phishing and credential theft against authenticated and unauthenticated users.
Affected Products
- WSO2 API Manager versions 3.2.0, 3.2.1, 4.0.0, 4.1.0, 4.2.0, 4.3.0, 4.4.0
- WSO2 Identity Server versions 5.10.0, 5.11.0, 6.0.0, 6.1.0, 7.0.0
- Additional WSO2 products listed in the vendor advisory
Discovery Timeline
- 2025-09-23 - CVE-2024-6429 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2024-6429
Vulnerability Analysis
The vulnerability resides in how affected WSO2 products render error messages sourced from URL parameters. When a request triggers an error condition, the application echoes the supplied error string directly into the response page without sanitization or validation. An attacker crafts a URL containing malicious text in the error parameter and delivers it to a victim through phishing, chat, or embedded links.
When the victim clicks the link, the WSO2 application renders the attacker's content within its own trusted interface. Because the URL points to a legitimate WSO2 host and the browser displays the injected text on that origin, users perceive the message as authoritative. This creates conditions favorable for credential harvesting, fraudulent instructions, or fake support prompts.
The impact is limited to integrity of displayed content; confidentiality and availability are not directly affected. However, the trust context makes the flaw useful as a staging component in broader social engineering chains.
Root Cause
The root cause is the absence of input validation and output encoding for error strings received via URL parameters. The application treats untrusted client-supplied values as safe content for rendering in server-generated pages.
Attack Vector
Exploitation requires a network-reachable WSO2 endpoint and user interaction. An attacker constructs a URL such as one that includes a manipulated error message parameter pointing at a vulnerable WSO2 host. The victim must open the link, at which point the manipulated content renders inside the WSO2 UI. No authentication is required to trigger the behavior.
See the WSO2 Security Advisory WS02-2024-3490 for technical details on affected endpoints and parameters.
Detection Methods for CVE-2024-6429
Indicators of Compromise
- Web server access logs showing requests to WSO2 endpoints containing unusually long, encoded, or human-readable text within error-related URL parameters.
- Referrer headers indicating that users arrived at WSO2 error pages from external domains, chat platforms, or email link trackers.
- Repeated requests from the same source IP probing multiple error parameter variations.
Detection Strategies
- Deploy web application firewall rules that inspect query strings for suspicious content in error message parameters on WSO2 hosts.
- Correlate authentication failures and password reset events with preceding requests to spoofable error endpoints.
- Baseline normal error parameter values in production traffic and alert on entries containing sentence-like text, brand names, or URLs.
Monitoring Recommendations
- Forward WSO2 API Manager and Identity Server access logs to a centralized logging platform for retention and search.
- Monitor outbound user reports of unexpected messages appearing on WSO2 login and portal pages.
- Alert on spikes in traffic to error-handling URLs, which often indicate spoofing campaigns in progress.
How to Mitigate CVE-2024-6429
Immediate Actions Required
- Review the WSO2 Security Advisory WS02-2024-3490 and identify all affected WSO2 deployments in your environment.
- Apply the vendor-supplied WUM updates or patches to WSO2 API Manager and WSO2 Identity Server instances.
- Notify end users and administrators about phishing risks referencing WSO2 branded error pages until patches are deployed.
Patch Information
WSO2 has published remediation guidance in advisory WSO2-2024-3490. Customers should apply the recommended updates for their specific product and version combination. Refer to the WSO2 Security Advisory for exact patch identifiers and upgrade paths.
Workarounds
- Configure a reverse proxy or web application firewall to strip or validate error message parameters before they reach the WSO2 application.
- Restrict access to WSO2 management and portal endpoints to trusted networks where feasible, reducing exposure to unauthenticated attackers.
- Enforce strict Content Security Policy headers and user awareness training to reduce the effectiveness of spoofed error content.
# Example WAF rule concept - block error parameters containing HTML-like content
# Consult your WAF vendor documentation for exact syntax
# Rule: Deny requests where query parameter 'errorMsg' matches suspicious patterns
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
