CVE-2025-63019: Cookies and CSP Info Disclosure Flaw

CVE-2025-63019 Overview

CVE-2025-63019 is a Sensitive Data Exposure vulnerability affecting the WordPress "Cookies and Content Security Policy" plugin developed by Johan Jonk Stenström. The vulnerability, classified under CWE-201 (Insertion of Sensitive Information Into Sent Data), allows attackers to retrieve embedded sensitive data from the affected plugin.

This issue exists in the plugin's handling of data transmission, where sensitive information is inadvertently included in outgoing data. Attackers can exploit this flaw to extract confidential information that should not be exposed, potentially leading to further compromise of WordPress installations using the vulnerable plugin.

Critical Impact

Attackers can retrieve embedded sensitive data from WordPress sites running vulnerable versions of the Cookies and Content Security Policy plugin, potentially exposing confidential configuration data or user information.

Affected Products

• WordPress Cookies and Content Security Policy plugin version 2.34 and earlier
• All WordPress installations using the vulnerable plugin versions
• Sites relying on this plugin for cookie consent and CSP management

Discovery Timeline

• 2026-01-22 - CVE-2025-63019 published to NVD
• 2026-01-22 - Last updated in NVD database

Technical Details for CVE-2025-63019

Vulnerability Analysis

The vulnerability exists within the Cookies and Content Security Policy WordPress plugin, which is designed to help site administrators manage cookie consent notices and Content Security Policy headers. The core issue stems from improper handling of sensitive information during data transmission operations.

When the plugin processes certain operations, it inadvertently includes sensitive data in outgoing communications. This data exposure occurs because the plugin fails to properly sanitize or filter sensitive information before including it in responses or transmitted data packets. The vulnerability allows unauthorized parties to intercept or extract this embedded sensitive information.

The impact of this vulnerability includes potential exposure of WordPress configuration details, user session information, or other sensitive data that the plugin has access to during its normal operation. Since this is a WordPress plugin, it operates within the context of the WordPress installation and may have access to various site data.

Root Cause

The root cause of CVE-2025-63019 is classified under CWE-201: Insertion of Sensitive Information Into Sent Data. This weakness occurs when the software sends data to another actor (such as a web browser, external server, or client application) but includes sensitive information that should not be accessible to that actor.

In the context of the Cookies and Content Security Policy plugin, the implementation fails to properly separate sensitive data from the information being transmitted. This could occur in various scenarios such as debug output being left enabled in production, improper API response handling, or inadequate data filtering in the plugin's output mechanisms.

Attack Vector

An attacker can exploit this vulnerability by interacting with a WordPress site running the vulnerable plugin version. The attack does not require authentication in the typical scenario, as the sensitive data exposure occurs during normal plugin operations.

The exploitation process involves:

1. Identifying a WordPress site running the vulnerable Cookies and Content Security Policy plugin version 2.34 or earlier
2. Triggering the plugin functionality that causes the sensitive data to be included in transmitted data
3. Capturing or extracting the sensitive information from the plugin's responses
4. Using the retrieved data for further attacks or unauthorized access

For detailed technical information about this vulnerability, refer to the Patchstack Vulnerability Advisory.

Detection Methods for CVE-2025-63019

Indicators of Compromise

• Unusual outbound data patterns from WordPress installations
• Unexpected data in HTTP responses from the plugin's endpoints
• Evidence of plugin configuration or sensitive data appearing in client-side logs or network captures
• Anomalous requests targeting the Cookies and Content Security Policy plugin functionality

Detection Strategies

• Monitor WordPress plugin directories for the presence of cookies-and-content-security-policy plugin and verify version numbers
• Implement web application firewall rules to detect abnormal data exfiltration patterns
• Review HTTP response headers and bodies for unexpected sensitive data inclusion
• Conduct regular WordPress security audits focusing on installed plugins and their versions

Monitoring Recommendations

• Enable detailed logging for WordPress plugin activities
• Implement network traffic analysis to identify potential data exfiltration attempts
• Configure alerts for changes to the Cookies and Content Security Policy plugin settings
• Monitor for reconnaissance activities targeting WordPress plugin endpoints

How to Mitigate CVE-2025-63019

Immediate Actions Required

• Audit all WordPress installations for the presence of the Cookies and Content Security Policy plugin
• Identify any installations running version 2.34 or earlier
• Consider temporarily disabling the plugin until a patched version is available
• Review server and application logs for signs of exploitation attempts

Patch Information

Users should monitor the WordPress plugin repository and the Patchstack Vulnerability Advisory for updates from the plugin author. Update to the latest available version once a security patch is released.

WordPress administrators should:

• Enable automatic updates for security patches when available
• Subscribe to security notifications from Patchstack or WordPress security resources
• Regularly check the plugin changelog for security-related updates

Workarounds

• Temporarily disable the Cookies and Content Security Policy plugin if not critical to site operation
• Implement a Web Application Firewall (WAF) to filter potentially sensitive data from outgoing responses
• Consider alternative plugins for cookie consent and CSP management until a patch is available
• Restrict access to WordPress admin areas and plugin settings to trusted users only

# WordPress CLI command to check plugin version
wp plugin list --name=cookies-and-content-security-policy --format=table

# Temporarily deactivate the vulnerable plugin
wp plugin deactivate cookies-and-content-security-policy

# Check for available updates
wp plugin update cookies-and-content-security-policy --dry-run