Zitadel /saml-post Endpoint XSS Vulnerability Analysis
A critical XSS vulnerability in Zitadel's /saml-post endpoint allows account takeovers via malicious scripts. The PoC highlights the need for immediate defensive measures.
CVE References
Affected
The /saml-post endpoint in Zitadel improperly handles user-supplied parameters, allowing injection of arbitrary JavaScript. This occurs due to lack of input sanitization and HTML encoding, enabling malicious scripts execution.
The PoC demonstrates a straightforward exploit for account takeover, proving the severity of unmitigated XSS flaws. It reliably exploits under normal usage conditions, making it highly dangerous.
[{'type': 'network_signature', 'description': 'Monitor for requests to /saml-post containing javascript: URLs or unexpected parameters.'}, {'type': 'log_analysis', 'description': 'Look for unusual activity, such as multiple failed login attempts or script execution warnings in logs.'}]
[{'type': 'code_patch', 'description': 'Sanitize and validate all user inputs on the /saml-post endpoint. Implement output encoding to prevent raw HTML rendering.'}, {'type': 'configuration_change', 'description': 'Apply rate-limiting to the endpoint and consider temporary access restrictions until patched.'}]
High likelihood of exploitation due to critical impact and known PoC. Targets users with SAML integration, making it attractive for attackers aiming for high-value data.
Sources