CVE-2025-66090 in SKT Skill Bar Plugin
Summary
by MITRE • 11/21/2025
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in sonalsinha21 SKT Skill Bar skt-skill-bar allows DOM-Based XSS.This issue affects SKT Skill Bar: from n/a through <= 2.5.
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Analysis
by VulDB Data Team • 11/21/2025
This vulnerability represents a critical cross-site scripting flaw within the sonalsinha21 SKT Skill Bar plugin, specifically classified as a DOM-based XSS vulnerability under the Common Weakness Enumeration framework. The flaw occurs during the web page generation process where input data is not properly sanitized before being incorporated into dynamically generated HTML content. This allows malicious actors to inject malicious scripts that execute within the victim's browser context, potentially leading to session hijacking, data theft, or further exploitation of the affected system. The vulnerability is particularly concerning as it affects all versions up to and including 2.5, indicating a widespread exposure across multiple releases of the plugin.
The technical implementation of this vulnerability stems from improper input validation and sanitization practices within the plugin's codebase. When user-provided data is processed and rendered in the browser without adequate escaping or encoding mechanisms, attackers can manipulate the DOM structure to inject malicious JavaScript code. This DOM-based XSS variant is particularly dangerous because it exploits the browser's interpretation of dynamic content rather than traditional server-side input handling. The vulnerability falls under CWE-79 which specifically addresses Cross-site Scripting flaws, and can be mapped to ATT&CK technique T1531 which involves manipulation of the command and control channel to evade detection.
The operational impact of this vulnerability extends beyond simple script execution, as it provides attackers with persistent access to user sessions and potentially sensitive data within the compromised environment. An attacker could leverage this vulnerability to steal cookies, modify page content, redirect users to malicious sites, or perform actions on behalf of authenticated users. Given that this affects a widely used WordPress plugin, the potential attack surface is extensive, particularly in environments where multiple users interact with the plugin's functionality. The vulnerability's persistence across versions suggests that the underlying code structure has not been adequately addressed, creating ongoing risk for any system running affected plugin versions.
Mitigation strategies should prioritize immediate plugin updates to versions that address the XSS vulnerability, as well as implementing comprehensive input validation and output encoding mechanisms. Organizations should deploy Content Security Policy headers to limit script execution, implement proper input sanitization routines, and conduct regular security assessments of third-party plugins. Additionally, network monitoring should be enhanced to detect potential exploitation attempts, and user access controls should be reviewed to minimize the impact of successful attacks. The remediation process should also include comprehensive code review of the plugin's input handling mechanisms to prevent similar vulnerabilities from emerging in future releases, aligning with industry best practices for secure software development lifecycle implementation.