CVE-2026-100507 in If-So Dynamic Content Plugin
Summary
by MITRE • 09/30/2026
Unauthenticated Cross Site Scripting (XSS) in If-So Dynamic Content Personalization <= 1.10.1 versions.
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Analysis
by VulDB Data Team • 09/30/2026
The vulnerability identified as an unauthenticated cross-site scripting flaw within the If-So Dynamic Content Personalization plugin, affecting versions up to and including 1.10.1, represents a significant security risk for websites relying on this tool for content personalization. This specific weakness stems from insufficient input validation and sanitization mechanisms when processing user-supplied data that is subsequently rendered in web pages without proper encoding. Because the vulnerability exists at an unauthenticated level, any individual with access to the target website can exploit it without needing valid credentials or a logged-in session, thereby lowering the barrier for entry significantly compared to authenticated vulnerabilities. The core technical flaw involves the application's failure to properly neutralize special characters within user inputs before including them in dynamic content outputs. When an attacker injects malicious script code into fields such as comment sections, search queries, or URL parameters that are reflected back by the plugin’s personalization logic, the browser executes this code in the context of the victim’s session. This behavior aligns with Common Weakness Enumeration CWE-79, which classifies improper neutralization of input during web page generation as a primary cause for cross-site scripting attacks.
The operational impact of exploiting this vulnerability is severe and multifaceted, primarily centered around the compromise of user confidentiality and integrity within the affected website environment. An attacker can leverage the executed JavaScript to perform session hijacking by stealing authentication cookies or tokens stored in local storage, potentially gaining unauthorized access to administrative accounts if those users are logged in at the time of exploitation. Furthermore, the vulnerability enables phishing attacks where attackers can inject fake login forms or deceptive content that mimics legitimate site elements, tricking visitors into revealing sensitive information such as passwords or credit card details. Beyond direct data theft, this flaw allows for defacement of the website’s appearance and functionality, damaging the organization's reputation and user trust. From a threat intelligence perspective, this attack vector maps directly to MITRE ATT&CK technique T1059.007, which covers JavaScript execution in web browsers, often utilized as part of broader campaigns involving drive-by downloads or credential harvesting operations targeting WordPress-based infrastructure.
Mitigation strategies for this vulnerability require immediate action from both site administrators and plugin developers. The most effective remediation is to upgrade the If-So Dynamic Content Personalization plugin to a version newer than 1.10.1, where the developer has presumably implemented robust input sanitization and output encoding practices such as using htmlspecialchars or equivalent functions in PHP to ensure that special characters are safely escaped before rendering. For organizations unable to update immediately due to compatibility constraints, implementing Web Application Firewall rules can provide temporary protection by detecting and blocking common XSS payloads containing script tags, event handlers, or encoded JavaScript attempts within HTTP requests. Additionally, enforcing Content Security Policy headers on the web server can significantly mitigate the impact of successful exploitation by restricting the sources from which scripts are allowed to execute, thereby preventing injected malicious code from running even if it is successfully inserted into the page DOM. Regular security audits and penetration testing should be conducted to verify that input validation controls are functioning correctly across all user-facing endpoints exposed by the plugin.