Stored XSS via Malicious URL Redirect in NocoDB

Compliance Impact

This vulnerability is an open redirect issue that allows attackers to redirect users to attacker-controlled domains via crafted links. Such redirections can facilitate phishing attacks by impersonating legitimate NocoDB login interfaces.

While the provided information does not explicitly mention compliance with standards like GDPR or HIPAA, open redirect vulnerabilities can indirectly impact compliance by enabling phishing attacks that may lead to unauthorized access or disclosure of personal or sensitive data.

Therefore, organizations using affected versions of NocoDB should consider this vulnerability as a risk factor in their overall security posture, which is relevant for maintaining compliance with data protection regulations that require safeguarding user data and preventing unauthorized access.

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Detection Guidance

This vulnerability can be detected by monitoring for suspicious URL hash fragments in client requests that include protocol-relative URLs (starting with //) used in redirection. Since the issue involves the client-side hashRedirect plugin improperly handling URL hash fragments, detection involves identifying URLs where the hash fragment contains paths starting with // which could trigger an open redirect.

One approach is to search web server logs or proxy logs for requests containing URL hash fragments with protocol-relative URLs. For example, you can use command-line tools to search for suspicious patterns in logs.

• Using grep to find suspicious URL hashes in logs: grep -E '#//[^ ]+' access.log
• Using curl to test if a crafted URL triggers a redirect: curl -I 'https://your-nocodb-instance/#//attacker.com/malicious-path' -L

Additionally, manual testing by crafting URLs with hash fragments starting with // and observing if the client is redirected to an external domain can help confirm the vulnerability.

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Executive Summary

This vulnerability exists in NocoDB versions prior to 2026.04.1 in the client-side hashRedirect plugin. The plugin uses window.location.replace() to redirect users based on a path extracted from the URL hash fragment, but it only checks if the path starts with a '/'.

Because protocol-relative URLs (which start with //) also satisfy this check, an attacker can craft a link that causes the plugin to silently redirect visitors to an attacker-controlled website without their knowledge.

This issue is fixed in version 2026.04.1.

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Impact Analysis

This vulnerability can lead to users being silently redirected to malicious websites controlled by attackers.

Such redirections can be used for phishing attacks, stealing user credentials, delivering malware, or other malicious activities that compromise user security and trust.

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Mitigation Strategies

To mitigate this vulnerability, upgrade NocoDB to version 2026.04.1 or later, where the issue with the hashRedirect plugin has been fixed.

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