CVE-2026-24601 in Penci Pay Writer Plugin
Summary
by MITRE • 01/23/2026
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in PenciDesign Penci Pay Writer penci-pay-writer allows Stored XSS.This issue affects Penci Pay Writer: from n/a through <= 1.5.
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Analysis
by VulDB Data Team • 01/23/2026
This vulnerability represents a critical cross-site scripting flaw in the Penci Pay Writer plugin for WordPress, specifically impacting versions up to and including 1.5. The issue falls under the Common Weakness Enumeration category CWE-79 which defines improper neutralization of input during web page generation as a fundamental weakness in web application security. The vulnerability allows attackers to inject malicious scripts that persist in the application's database and execute whenever users view affected pages, creating a stored cross-site scripting condition that can compromise user sessions and data.
The technical implementation of this flaw occurs during the web page generation process where user input submitted through the plugin's interface fails to undergo proper sanitization or encoding before being rendered in HTML output. When administrators or users interact with the plugin's functionality, particularly when entering content that gets stored in the database, the malicious script payloads are not adequately escaped or filtered. This creates a persistent vector where attackers can craft malicious input that survives the storage phase and executes in the browser context of other users who view the affected content, making this a particularly dangerous vulnerability for multi-user environments.
The operational impact of this vulnerability extends beyond simple script execution as it provides attackers with the ability to hijack user sessions, steal sensitive information, manipulate data, and potentially escalate privileges within the affected WordPress installation. Attackers can leverage this stored XSS to execute malicious JavaScript code that can capture cookies, redirect users to phishing sites, modify page content, or perform actions on behalf of authenticated users. The vulnerability's persistence through storage means that even if users are not actively viewing the affected pages, the malicious scripts remain active and can be triggered when legitimate users access the compromised content, creating an ongoing threat vector that can affect multiple users over time.
Mitigation strategies for this vulnerability should include immediate patching to version 1.6 or later where the XSS flaw has been addressed through proper input sanitization and output encoding mechanisms. Administrators should implement comprehensive input validation and sanitization routines that follow the principle of least privilege and proper HTML escaping techniques. The recommended approach aligns with ATT&CK technique T1566 which involves phishing attacks and social engineering, as attackers often leverage XSS vulnerabilities to create malicious payloads that can be delivered through compromised web applications. Additional protective measures include implementing content security policies, regular security audits of plugin installations, and maintaining up-to-date security monitoring to detect and respond to potential exploitation attempts. Organizations should also consider deploying web application firewalls and implementing proper security configurations to reduce the attack surface and prevent unauthorized modifications to the affected plugin's functionality.