The FlatPM – Ad Manager, AdSense and Custom Code plugin for WordPress is vulnerable to Stored Cross-Site Scripting (XSS) via the 'rank_math_description' custom field. This vulnerability allows authenticated attackers, with contributor level access and above, to inject arbitrary web scripts into pages. This issue affects all versions up to, and including, 3.2.2, due to insufficient input sanitization and output escaping.
With a CVSS score of 6.4, this vulnerability is classified as medium severity. The implications of this vulnerability are significant, as it enables attackers to manipulate web pages visited by users, potentially leading to unauthorized actions or information disclosure.
Risk to organizations includes the potential for unauthorized script execution that can lead to session hijacking, data theft, or other malicious activities. Organizations should prioritize patching immediately to mitigate the risk posed by this vulnerability.
Current exploitation status indicates that there are no public exploits confirmed for this vulnerability, however, the risk remains due to the nature of the flaw and the access level required for exploitation.
Given the potential impact and the exploitation vector, organizations should evaluate their use of the FlatPM plugin and take necessary actions to apply updates or seek alternatives.
Vulnerability Details
The vulnerability allows for stored cross-site scripting due to insufficient input validation, specifically in the 'rank_math_description' custom field. The affected plugin versions are all prior to 3.2.2, and it has been assigned CWE-79. The vulnerability was published on January 20, 2026.
Technical Analysis
The root cause of this vulnerability is the failure to properly sanitize and escape user input on the 'rank_math_description' field. This allows attackers to inject malicious scripts into the content that is subsequently rendered on the website.
The attack vector is network-based, meaning that attackers can exploit this vulnerability remotely without physical access to the server. The complexity of exploiting this vulnerability is low, as it only requires contributor-level access to execute.
No user interaction is required for the attack to succeed, making it a significant threat. The confidentiality and integrity impacts are classified as low, while there is no impact on availability.
Risk & Impact Analysis
The real-world deployment risk is considerable, given the potential for attackers to execute arbitrary scripts. This vulnerability may allow for the exploitation of user sessions, leading to further data breaches or unauthorized actions.
Organizations should consider the blast radius of this vulnerability, especially if the plugin is widely used across multiple sites or applications. The urgency for addressing this vulnerability is further heightened by its medium CVSS score and potential for exploitation.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The vulnerability affects all versions of the FlatPM plugin up to and including version 3.2.2. Organizations using this plugin should take immediate steps to patch their installations.
Mitigation & Remediation
To mitigate this vulnerability, organizations should update the FlatPM plugin to the latest version that addresses this issue. If a patch is not available, consider implementing input validation and output escaping mechanisms to sanitize user input effectively.
Organizations may also benefit from conducting regular security assessments, such as application security assessments, to identify and remediate vulnerabilities proactively.
Detection Guidance
Monitoring logs for unexpected script executions or user interactions that seem abnormal can help in detecting potential exploitation attempts. Additionally, organizations should look for behavioral anomalies within their applications.
AppSecure Threat Intelligence Insight
This vulnerability represents a common weakness in web application security, specifically related to insufficient input validation. Security teams must prioritize the implementation of robust input sanitization practices to prevent similar vulnerabilities in the future.
Organizations are advised to stay updated on security trends and best practices through resources such as the penetration testing methodology. Regular training and awareness programs can also enhance the overall security posture.
Finally, organizations should consider utilizing red teaming services to simulate attack scenarios and identify weaknesses before they can be exploited.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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