CVE-2026-65528 in BSK PDF Manager Plugin
Summary
by MITRE • 07/23/2026
Contributor Cross Site Scripting (XSS) in BSK PDF Manager <= 3.8 versions.
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Analysis
by VulDB Data Team • 07/23/2026
The vulnerability under discussion represents a cross site scripting flaw that affects the BSK PDF Manager plugin for WordPress, specifically impacting versions 3.8 and earlier. This type of vulnerability falls under the category of insecure input handling where user-supplied data is not properly sanitized before being rendered in web pages. The issue stems from the plugin's failure to adequately validate and escape user inputs that are subsequently displayed in the browser context, creating an avenue for malicious actors to inject arbitrary javascript code into web pages viewed by other users.
This vulnerability operates through a contributor role exploitation model where users with contributor privileges can leverage the XSS flaw to execute malicious scripts within the context of other users' browsers. The technical implementation involves the plugin's handling of PDF-related parameters or metadata that are processed and output without proper sanitization measures. When a contributor uploads or modifies PDF content, the system fails to encode special characters properly, allowing attackers to inject script tags or other malicious payloads that execute in the victim's browser session.
The operational impact of this vulnerability extends beyond simple script execution as it enables attackers to perform various malicious activities including session hijacking, credential theft, defacement of content, and redirection to malicious sites. The low privilege requirement makes this particularly dangerous since contributors typically have limited access rights but can exploit this weakness to escalate their privileges or compromise other users within the same WordPress installation. The vulnerability aligns with CWE-79 which specifically addresses cross site scripting flaws in web applications, and maps to ATT&CK technique T1566.001 for initial access through spearphishing attachments.
Mitigation strategies should focus on immediate plugin updates to versions that address the XSS vulnerability, along with implementing proper input validation and output encoding mechanisms throughout the application. Organizations should also consider implementing content security policies to restrict script execution, regularly audit user roles and permissions, and monitor for suspicious contributor activities. The fix typically involves sanitizing all user inputs before rendering them in web contexts and ensuring proper HTML escaping of dynamic content to prevent malicious scripts from executing in the browser environment.
Additional protective measures include regular security audits of WordPress plugins, implementing web application firewalls to detect and block XSS attempts, and educating users about the risks of uploading untrusted content. The vulnerability demonstrates the importance of proper input validation across all user-facing interfaces within web applications, particularly those handling file uploads or user-generated content. Organizations should also consider implementing automated scanning tools that can identify similar vulnerabilities in their WordPress installations and maintain up-to-date security patches for all installed plugins and themes to prevent exploitation of known weaknesses.