CVE-2026-87971 in If-So Dynamic Content Plugin
Summary
by MITRE • 10/07/2026
The If-So Dynamic Content WordPress plugin before 1.10.2 does not validate the URL scheme of a request-supplied value before reflecting it into a link on an admin page, allowing attackers to execute arbitrary JavaScript in the browser of a logged-in user who opens a crafted link.
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Analysis
by VulDB Data Team • 10/07/2026
The vulnerability identified in If-So Dynamic Content for WordPress prior to version 1.10.2 represents a classic instance of Cross-Site Scripting within an administrative context, specifically categorized under CWE-79 Improper Neutralization of Input During Web Page Generation known as Reflected XSS. This flaw stems from the application's failure to perform adequate validation or sanitization on user-supplied input before it is rendered back into the HTML structure of a dynamic content module. The specific technical deficiency lies in the handling of URL schemes, where the plugin accepts arbitrary values for link destinations without verifying that they conform to safe protocols such as HTTP or HTTPS. By neglecting this critical check, the software inadvertently permits the injection of malicious JavaScript code through data URIs or other executable protocol handlers embedded within the request parameters.
From an operational perspective, this vulnerability poses a severe risk due to its location within the WordPress administration interface. Unlike vulnerabilities affecting public-facing pages where authentication is not required, this flaw targets logged-in users with administrative privileges. An attacker can craft a deceptive URL containing malicious script payloads disguised as legitimate plugin settings or dynamic content configurations. When an administrator clicks on such a link while authenticated, their browser executes the injected JavaScript within the context of the WordPress admin dashboard. This execution environment grants the malicious code access to all cookies, session tokens, and local storage associated with the administrative account, effectively bypassing standard security boundaries that rely on authentication status for protection.
The impact of this vulnerability extends beyond simple script execution, as it enables a wide range of attacks facilitated by the ATT&CK technique T1059 Command and Scripting Interpreter within an application context. Attackers can leverage the elevated privileges to exfiltrate sensitive site data, including database credentials, user lists, and configuration files. Furthermore, the compromised session allows for persistent backdoor installation, modification of website content without authorization, or pivoting into other systems connected via shared network resources. The lack of output encoding means that any script embedded in the URL scheme is interpreted directly by the browser's rendering engine, turning a simple link click into a full-scale compromise event with minimal user interaction beyond clicking the malicious hyperlink.
Mitigation strategies for this vulnerability focus primarily on immediate software updates and robust input validation practices. Administrators must upgrade to version 1.10.2 or later of the If-So Dynamic Content plugin, where developers have implemented proper sanitization routines that strip out dangerous protocol handlers like javascript: before rendering links. In environments where updating is not immediately feasible, temporary mitigations include restricting access to the WordPress admin area through IP whitelisting and enforcing multi-factor authentication to reduce the likelihood of credential theft via session hijacking following exploitation. Additionally, implementing a Content Security Policy header that restricts script execution sources can provide an additional layer of defense by preventing inline scripts from executing even if they are successfully injected into the DOM. Long-term remediation should involve adopting secure coding standards such as OWASP Top Ten guidelines, specifically emphasizing input validation and output encoding to prevent similar reflection-based injection flaws in future development cycles.