CVE-2025-2946: pgAdmin 4 XSS Vulnerability

CVE-2025-2946 Overview

CVE-2025-2946 is a Cross-Site Scripting (XSS) vulnerability affecting pgAdmin 4 versions 9.1 and earlier. This security flaw allows attackers to execute arbitrary HTML and JavaScript code in a user's browser through malicious query result rendering. When a user views specially crafted query results, the malicious scripts execute within the context of the pgAdmin web interface, potentially compromising user sessions and sensitive database information.

Critical Impact

Attackers can execute arbitrary JavaScript in authenticated user sessions, potentially leading to session hijacking, credential theft, or unauthorized database operations through the pgAdmin interface.

Affected Products

• pgAdmin 4 versions 9.1 and earlier
• pgAdmin 4 for PostgreSQL (all platforms)

Discovery Timeline

• 2025-04-03 - CVE-2025-2946 published to NVD
• 2025-04-23 - Last updated in NVD database

Technical Details for CVE-2025-2946

Vulnerability Analysis

This XSS vulnerability exists in pgAdmin 4's query result rendering mechanism. The application fails to properly sanitize or encode output when displaying query results to users. This allows an attacker who can influence database content or query results to inject malicious HTML or JavaScript that will execute when an administrator or user views the affected data through the pgAdmin web interface.

The vulnerability is classified as CWE-79 (Improper Neutralization of Input During Web Page Generation), which represents a fundamental failure in output encoding. Since pgAdmin is commonly used by database administrators with elevated privileges, successful exploitation could provide attackers with significant access to database systems.

Root Cause

The root cause of CVE-2025-2946 is improper output encoding in pgAdmin 4's query result display functionality. When rendering query results in the browser, the application does not adequately sanitize user-controllable data before inserting it into the HTML DOM. This allows HTML tags and JavaScript code embedded in database content to be interpreted as executable code rather than being safely rendered as text.

Attack Vector

The attack requires user interaction, as a victim must view the malicious query results through the pgAdmin interface. An attacker could exploit this vulnerability by:

1. Inserting malicious JavaScript payloads into database fields that will be queried by pgAdmin users
2. Crafting a query that returns specially formatted results containing XSS payloads
3. Socially engineering a database administrator to execute a query that returns the malicious content

When the victim views the query results, the embedded JavaScript executes in their browser context with the same privileges as their authenticated pgAdmin session. This could enable session token theft, keylogging, or further attacks against the database infrastructure.

For technical details and discussion of this vulnerability, see the GitHub Issue Report.

Detection Methods for CVE-2025-2946

Indicators of Compromise

• Unusual JavaScript or HTML tags present in database field values, particularly <script> tags or event handlers
• Unexpected network requests originating from pgAdmin browser sessions to external domains
• Browser developer console showing JavaScript execution errors from unexpected inline scripts
• User session tokens or credentials appearing in external server logs

Detection Strategies

• Monitor database audit logs for INSERT or UPDATE statements containing HTML/JavaScript patterns in string values
• Implement Content Security Policy (CSP) headers to detect and block inline script execution
• Review web application firewall logs for XSS patterns in requests to pgAdmin endpoints
• Deploy browser-based security extensions that alert on suspicious script execution

Monitoring Recommendations

• Enable comprehensive logging for pgAdmin user sessions and query execution
• Monitor for anomalous outbound connections from client machines running pgAdmin
• Implement alerting for CSP violation reports if CSP headers are deployed
• Regularly audit database content for potentially malicious payloads in text fields

How to Mitigate CVE-2025-2946

Immediate Actions Required

• Upgrade pgAdmin 4 to the latest version that addresses CVE-2025-2946
• Review and sanitize existing database content for potentially malicious XSS payloads
• Restrict pgAdmin access to trusted networks and users until patching is complete
• Enable Content Security Policy headers on pgAdmin deployments where possible

Patch Information

Organizations should upgrade to a patched version of pgAdmin 4 that addresses this XSS vulnerability. Monitor the pgAdmin GitHub repository for official patch releases and security advisories. Ensure all pgAdmin installations are updated across development, staging, and production environments.

Workarounds

• Implement network-level restrictions to limit pgAdmin access to trusted IP addresses only
• Deploy a Web Application Firewall (WAF) with XSS protection rules in front of pgAdmin instances
• Use browser extensions that provide XSS protection for additional defense-in-depth
• Educate database administrators about the risk of viewing untrusted database content
• Consider using alternative PostgreSQL management tools until the patch is applied

# Example: Restrict pgAdmin access via iptables (Linux)
# Allow pgAdmin access only from trusted admin network
iptables -A INPUT -p tcp --dport 5050 -s 10.0.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 5050 -j DROP