CVE-2025-63019 in Cookies and Content Security Policy Plugin
Summary
by MITRE • 01/22/2026
Insertion of Sensitive Information Into Sent Data vulnerability in Johan Jonk Stenström Cookies and Content Security Policy cookies-and-content-security-policy allows Retrieve Embedded Sensitive Data.This issue affects Cookies and Content Security Policy: from n/a through <= 2.34.
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Analysis
by VulDB Data Team • 01/24/2026
The vulnerability identified as CVE-2025-63019 represents a critical insertion of sensitive information into sent data flaw within the Cookies and Content Security Policy plugin developed by Johan Jonk Stenström. This issue manifests as a sensitive data exposure vulnerability that allows attackers to retrieve embedded sensitive information through improperly handled cookie data. The vulnerability exists specifically within the plugin's handling of cookies and content security policy mechanisms, creating an avenue for unauthorized data access that could compromise user privacy and system security. The affected version range spans from the initial release through version 2.34, indicating a prolonged period during which this security weakness was present in the software.
The technical implementation flaw resides in how the plugin processes and transmits cookie data containing sensitive information. When the plugin handles cookies and content security policies, it fails to properly sanitize or mask sensitive data elements that may be embedded within cookie values or headers. This insufficient data handling creates a situation where sensitive information such as session tokens, user identifiers, or other confidential data can be inadvertently exposed through the cookie transmission mechanism. The vulnerability operates at the application layer, specifically targeting the HTTP cookie management system where sensitive data is not adequately protected during the data transmission process. This flaw aligns with CWE-200, which addresses the exposure of sensitive information to an unauthorized actor, and represents a direct violation of secure coding practices for data handling and transmission.
The operational impact of this vulnerability extends beyond simple data exposure, potentially enabling attackers to perform session hijacking, user impersonation, and privilege escalation attacks. When sensitive information is embedded within sent data, attackers can intercept and extract this information through various network monitoring techniques, man-in-the-middle attacks, or by exploiting the plugin's cookie handling mechanisms. The vulnerability affects not only the confidentiality of user data but also the integrity of the content security policy enforcement, potentially allowing attackers to bypass security controls and access protected resources. This weakness could enable adversaries to gain unauthorized access to user accounts, extract session information, and compromise the overall security posture of systems utilizing the affected plugin. The impact is particularly severe in environments where the plugin handles authentication cookies or other security-sensitive data elements, as it directly undermines the security mechanisms designed to protect user sessions and confidential information.
Mitigation strategies for this vulnerability should focus on immediate patching of the affected plugin to version 2.35 or later, which contains the necessary security fixes. Organizations should implement comprehensive cookie sanitization procedures that ensure sensitive data is never embedded within cookie values or transmitted in plaintext form. Network administrators should deploy monitoring solutions to detect unusual cookie data patterns and implement proper input validation for all cookie handling processes. Security teams should conduct thorough audits of all plugins and components that handle user session data, ensuring that sensitive information is properly masked or encrypted before transmission. Additionally, implementing proper content security policy configurations can help mitigate the impact of potential data exposure, while regular security assessments should be performed to identify similar vulnerabilities in other software components. The remediation process should also include reviewing and updating network security policies to prevent unauthorized access to cookie data and implementing proper access controls for systems that process sensitive information through cookie mechanisms. This vulnerability demonstrates the critical importance of secure cookie management practices and proper data handling procedures in maintaining application security and user privacy protection.