CVE-2025-46239 in Theme Switcha Plugin
Summary
by MITRE • 04/22/2025
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Jeff Starr Theme Switcha allows Stored XSS. This issue affects Theme Switcha: from n/a through 3.4.
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Analysis
by VulDB Data Team • 04/22/2025
The vulnerability identified as CVE-2025-46239 represents a critical cross-site scripting flaw within the Jeff Starr Theme Switcha plugin, specifically affecting versions ranging from an unspecified initial version through 3.4. This weakness falls under the category of improper input neutralization during web page generation, creating a persistent security risk that enables attackers to execute malicious scripts in the context of affected user sessions. The vulnerability's classification as stored XSS (Cross-Site Scripting) indicates that malicious payloads are permanently stored on the server and subsequently served to other users, making it particularly dangerous as the attack vector persists beyond the initial injection point.
The technical exploitation of this vulnerability occurs when unfiltered user input is processed and rendered within web pages without proper sanitization or encoding mechanisms. In the context of the Theme Switcha plugin, this typically involves parameters or data fields that accept user-supplied content which is then incorporated into dynamically generated HTML output. When attackers craft malicious input containing script tags or other executable code, and this input is stored within the plugin's data structures, any user who views the affected page becomes vulnerable to script execution. This stored nature distinguishes the vulnerability from reflected XSS attacks where the malicious payload must be delivered through external means and is immediately executed.
From an operational impact perspective, this vulnerability creates significant risks for websites utilizing the Theme Switcha plugin, as it allows attackers to potentially hijack user sessions, steal sensitive information, modify website content, or redirect users to malicious sites. The stored nature of the XSS attack means that once the malicious payload is injected, it can affect multiple users over extended periods, making the impact cumulative and potentially devastating for website administrators and their visitors. The vulnerability's presence in multiple versions of the plugin suggests a widespread exposure across affected installations, potentially impacting numerous websites that have not yet updated to patched versions.
Security professionals should recognize this vulnerability as aligning with CWE-79, which specifically addresses cross-site scripting flaws in web applications, and the ATT&CK framework's T1566.001 technique covering initial access through spearphishing attachments, where the XSS payload could be delivered through malicious content. The remediation strategy must prioritize immediate plugin updates to versions that address the input sanitization gaps. Additionally, administrators should implement proper input validation and output encoding mechanisms, deploy content security policies to limit script execution, and conduct thorough security audits of all web applications to identify similar vulnerabilities. Regular security assessments and vulnerability scanning should be maintained to prevent future occurrences of such flaws, particularly focusing on user input handling and dynamic content generation processes that could be exploited for persistent XSS attacks.