Compliance Impact

The provided information does not specify any direct impact of this vulnerability on compliance with common standards and regulations such as GDPR or HIPAA.

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Executive Summary

This vulnerability is an HTML injection issue in pgAdmin 4's cloud deployment module. Certain endpoints propagate exception messages from AWS, Azure, and Google SDKs directly into JSON response fields without HTML-encoding them. The frontend then renders these messages as HTML, allowing an attacker to embed malicious HTML or JavaScript payloads into the application's interface.

For example, an authenticated user can submit a crafted access key containing an iframe payload. When the backend rejects this key, it includes the raw exception text containing the payload in the JSON response. The frontend parses this as HTML, causing the browser to load the attacker's iframe and potentially redirect the victim's pgAdmin tab.

Because the injection occurs within pgAdmin's own interface, common protections like X-Frame-Options and Content-Security-Policy frame-ancestors do not prevent exploitation. The baseline impact is self-targeted, but with an additional cross-site request forgery (CSRF) attack, other authenticated users could be targeted.

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Impact Analysis

This vulnerability can lead to cross-site scripting (XSS) attacks within the pgAdmin 4 cloud deployment interface. An attacker can inject malicious HTML or JavaScript that executes in the context of the victim's browser session.

• Self-targeted impact: The user who submits the malicious payload sees the injection and may be redirected or have malicious scripts executed.
• Potential escalation: If combined with a cross-site request forgery (CSRF) attack that submits the malicious payload on behalf of another authenticated user, the attacker can affect other users.

Such attacks can lead to session hijacking, unauthorized actions, or redirection to malicious sites, compromising the security and integrity of the pgAdmin environment.

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Detection Guidance

This vulnerability involves HTML injection through error messages returned by specific pgAdmin 4 cloud deployment module endpoints when processing crafted credentials. Detection involves monitoring requests and responses to these endpoints for suspicious payloads or injected HTML content.

Specifically, the reported entry point is the /rds/verify_credentials/ endpoint, along with other endpoints under /rds/, /azure/, /google/, and /cloud/ blueprints that propagate SDK exception text without HTML encoding.

To detect exploitation attempts, you can inspect HTTP requests to these endpoints for unusual or crafted access_key values containing HTML or JavaScript payloads (e.g., <iframe> tags). Similarly, responses containing unescaped HTML in the JSON info or errormsg fields may indicate attempted exploitation.

Example commands to detect suspicious activity might include using network traffic inspection tools or command-line utilities such as:

• Using curl or wget to manually test endpoints with crafted payloads and observe responses, e.g.: curl -i -X POST -d '{"access_key":"<iframe/src=...>"}' https://your-pgadmin-server/rds/verify_credentials/
• Using grep or similar tools on server logs to find requests containing suspicious HTML tags or error messages with unescaped HTML, e.g.: grep -r '<iframe' /var/log/pgadmin/
• Using web application security scanners or proxy tools (e.g., OWASP ZAP, Burp Suite) to automate detection of reflected HTML or JavaScript in JSON responses from the affected endpoints.

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Mitigation Strategies

The primary mitigation is to upgrade pgAdmin 4 to version 9.16 or later, where the vulnerability has been fixed by applying HTML-escaping to all external SDK exception strings before including them in JSON responses.

The fix involves sanitizing all error messages from AWS, Azure, and Google SDKs using a shared helper function that escapes HTML and strips control characters, preventing injection of malicious HTML or JavaScript.

Additionally, the frontend Cloud Wizard component was updated to render backend-derived error messages in plain-text mode, ensuring that even if escaping is missed, the messages are not parsed as HTML.

Until the upgrade is applied, consider restricting access to the affected endpoints to trusted users only, monitoring for suspicious requests, and applying web application firewall (WAF) rules to block requests containing suspicious HTML payloads.

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