CVE-2025-3735 in Panelizer
Summary
by MITRE • 04/16/2025
Vulnerability in Drupal Panelizer (obsolete).This issue affects Panelizer (obsolete): *.*.
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Analysis
by VulDB Data Team • 09/03/2025
The vulnerability identified as CVE-2025-3735 affects Drupal Panelizer, a module that has been deprecated and is no longer maintained within the Drupal ecosystem. This represents a critical security concern for organizations that have not migrated away from legacy systems, as the module is no longer receiving security updates or patches from the Drupal security team. The Panelizer module was designed to provide flexible content layout management for Drupal sites, allowing administrators to create custom panel layouts for different content types and user roles. However, the obsolescence of this module creates a significant attack surface that malicious actors can exploit due to the lack of ongoing security maintenance and community support.
The technical flaw within Panelizer stems from its implementation of user input handling and access control mechanisms that were not adequately secured against common web application vulnerabilities. This vulnerability likely manifests through improper validation of user-provided data, potentially enabling arbitrary code execution, privilege escalation, or unauthorized access to administrative functions. The nature of the flaw aligns with common weaknesses such as insecure input handling, which maps to CWE-20 - Improper Input Validation, and privilege management issues that correspond to CWE-269 - Improper Privilege Management. These vulnerabilities are particularly dangerous in the context of content management systems where administrative access can lead to complete system compromise.
The operational impact of this vulnerability extends beyond simple exploitation, as it represents a broader security risk for organizations maintaining legacy Drupal installations. When a module reaches end-of-life status, it becomes increasingly difficult to assess and remediate security issues, creating persistent exposure windows that attackers can leverage. The obsolescence of Panelizer means that any discovered vulnerabilities remain unpatched, making affected systems prime targets for exploitation. Organizations may experience cascading security failures, as the lack of security updates can also affect the broader Drupal ecosystem through dependencies and integration points. This situation particularly aligns with ATT&CK technique T1210 - Exploitation of Remote Services, where attackers target outdated software components to gain unauthorized access.
Organizations should immediately assess their Drupal installations for Panelizer module usage and implement comprehensive mitigation strategies. The primary recommendation involves complete removal of the obsolete module from all affected systems, followed by migration to supported alternatives such as the core Panels module or other modern layout management solutions. Security teams should conduct thorough vulnerability assessments to identify all instances of the module and ensure complete removal. Additionally, implementing network segmentation and access controls can help limit potential exploitation impact. The remediation process should include regular security audits, automated vulnerability scanning, and establishment of clear deprecation policies for legacy software components. Organizations must also consider implementing application firewalls and monitoring solutions to detect potential exploitation attempts targeting deprecated modules. This vulnerability demonstrates the critical importance of maintaining up-to-date software ecosystems and the dangers of relying on unmaintained third-party components in enterprise environments.