CVE-2025-6670: WSO2 API Control Plane CSRF Vulnerability

CVE-2025-6670 Overview

A Cross-Site Request Forgery (CSRF) vulnerability exists in multiple WSO2 products due to the use of the HTTP GET method for state-changing operations within admin services, specifically in the event processor of the Carbon console. Although the SameSite=Lax cookie attribute is used as a mitigation, it is ineffective in this context because it allows cookies to be sent with cross-origin top-level navigations using GET requests.

A malicious actor can exploit this vulnerability by tricking an authenticated user into visiting a crafted link, leading the browser to issue unintended state-changing requests. Successful exploitation could result in unauthorized operations such as data modification, account changes, or other administrative actions. According to WSO2 Secure Production Guidelines, exposure of Carbon console services to untrusted networks is discouraged, which may reduce the impact in properly secured deployments.

Critical Impact

Authenticated administrators can be tricked into performing unauthorized administrative actions including data modification, account changes, and other state-changing operations through crafted malicious links.

Affected Products

• WSO2 API Control Plane 4.5.0, 4.6.0
• WSO2 API Manager 3.1.0, 3.2.0, 3.2.1, 4.0.0, 4.1.0, 4.2.0, 4.3.0, 4.4.0, 4.5.0, 4.6.0
• WSO2 Enterprise Integrator 6.6.0
• WSO2 Identity Server 5.10.0, 5.11.0, 6.0.0, 6.1.0, 7.0.0, 7.1.0, 7.2.0
• WSO2 Identity Server as Key Manager 5.10.0
• WSO2 Open Banking AM 2.0.0
• WSO2 Open Banking IAM 2.0.0
• WSO2 Traffic Manager 4.5.0, 4.6.0
• WSO2 Universal Gateway 4.5.0, 4.6.0

Discovery Timeline

• 2025-11-18 - CVE-2025-6670 published to NVD
• 2025-12-08 - Last updated in NVD database

Technical Details for CVE-2025-6670

Vulnerability Analysis

This vulnerability (CWE-352: Cross-Site Request Forgery) stems from an insecure design pattern in the WSO2 Carbon console's event processor administrative services. The core issue is that state-changing operations are accessible via HTTP GET requests, which fundamentally violates the principle that GET requests should be idempotent and not cause side effects.

The vulnerability bypasses the SameSite=Lax cookie protection because this attribute specifically allows cookies to be sent with cross-origin top-level navigations that use GET requests. This is by design in the SameSite=Lax specification, which aims to balance security with usability for legitimate navigation scenarios. However, when GET requests can trigger state-changing operations, this protection becomes ineffective.

An attacker can craft a malicious URL that, when clicked by an authenticated administrator, will automatically submit a state-changing request to the vulnerable Carbon console endpoint. The victim's browser will include their valid session cookies with the request, causing the action to execute with the victim's privileges.

Root Cause

The root cause is the improper use of HTTP GET methods for administrative operations that modify server state. RESTful design principles dictate that GET requests should only retrieve data and never cause side effects. By implementing state-changing functionality behind GET endpoints, the application becomes vulnerable to CSRF attacks that bypass standard same-site cookie protections.

The SameSite=Lax cookie attribute was implemented as a defense mechanism, but it provides inadequate protection when:

1. State-changing operations use GET requests
2. Attackers use top-level navigation (link clicks, redirects) rather than cross-origin AJAX requests

Attack Vector

The attack exploits the network-accessible Carbon console through social engineering. An attacker crafts a malicious link containing the target administrative action in the URL parameters. When an authenticated administrator clicks this link (via phishing email, malicious website, or injected content), their browser performs a GET request to the vulnerable endpoint with valid session credentials attached.

The attack requires user interaction (clicking a link) and the victim must have an active authenticated session to the Carbon console. The attacker does not need any privileges on the target system, making this a pre-authentication attack vector that leverages legitimate user sessions.

Detection Methods for CVE-2025-6670

Indicators of Compromise

• Unusual GET requests to Carbon console administrative endpoints from external referrers
• Administrative actions logged with referrer headers pointing to external or suspicious domains
• Multiple rapid administrative changes originating from unexpected source IPs or user agents
• Session activity patterns showing administrative actions immediately following access to external URLs

Detection Strategies

• Monitor web server logs for GET requests to administrative endpoints with external Referer headers
• Implement anomaly detection for administrative actions that occur without corresponding user login activity patterns
• Configure Web Application Firewall (WAF) rules to flag or block GET requests with state-changing parameters to admin endpoints
• Review audit logs for administrative operations that lack expected preceding console navigation patterns

Monitoring Recommendations

• Enable verbose logging on all Carbon console administrative endpoints
• Implement real-time alerting for administrative actions from sessions with suspicious referrer patterns
• Deploy network traffic analysis to identify potential CSRF attack patterns targeting WSO2 infrastructure
• Configure SentinelOne Singularity Platform to monitor for suspicious browser-initiated requests to internal administrative consoles

How to Mitigate CVE-2025-6670

Immediate Actions Required

• Restrict Carbon console access to trusted networks only, following WSO2 Secure Production Guidelines
• Implement network segmentation to ensure administrative interfaces are not accessible from the internet
• Deploy a reverse proxy or WAF with CSRF protection rules in front of Carbon console endpoints
• Review and audit recent administrative actions for any unauthorized modifications

Patch Information

WSO2 has released security advisories and patches for this vulnerability. Refer to WSO2 Security Advisory WSO2-2025-4117 for specific patch versions and update instructions for each affected product.

Organizations should prioritize updating to patched versions of all affected WSO2 products. The patch modifies the Carbon console event processor to use proper HTTP methods (POST) for state-changing operations and implements anti-CSRF tokens.

Workarounds

• Restrict access to the Carbon console to trusted internal networks using firewall rules or network ACLs
• Implement a Web Application Firewall with CSRF protection that validates request origins and methods
• Configure authentication systems to require re-authentication for sensitive administrative operations
• Train administrators to avoid clicking links from untrusted sources while authenticated to administrative consoles

# Example: Restrict Carbon console access using iptables
# Only allow access from internal management network (10.0.0.0/8)
iptables -A INPUT -p tcp --dport 9443 -s 10.0.0.0/8 -j ACCEPT
iptables -A INPUT -p tcp --dport 9443 -j DROP

# Example: Nginx reverse proxy with referrer validation
# Add to location block for Carbon console
# if ($http_referer !~* "^https://your-trusted-domain\.com") {
#     return 403;
# }