CVE-2026-119504 in Frontend Admin Plugin
Summary
by MITRE • 11/09/2026
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in DynamiApps Frontend Admin by DynamiApps acf-frontend-form-element allows Stored XSS.This issue affects Frontend Admin by DynamiApps: from n/a through 3.30.1.
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Analysis
by VulDB Data Team • 11/09/2026
The identified security flaw represents a classic instance of improper neutralization of input during web page generation, commonly known as Cross-Site Scripting or XSS. Specifically, this vulnerability is classified under the CWE-79 standard within the Common Weakness Enumeration framework, which details weaknesses related to the injection of client-side scripts into web pages viewed by other users. In the context of DynamiApps Frontend Admin by DynamiApps, particularly affecting versions from n/a through 3.30.1 via the acf-front-end-form-element component, this vulnerability manifests as a Stored XSS attack vector. Unlike reflected XSS where malicious payloads are delivered immediately within an HTTP response, stored vulnerabilities persist on the target server, typically in a database or content management system, and are served to victims upon subsequent requests. This persistence significantly amplifies the potential impact of the exploit because it does not require complex social engineering tactics such as tricking a user into clicking a specially crafted link; instead, any user who views the affected page containing the malicious payload will trigger the execution of the injected script in their browser context.
The technical root cause lies in the insufficient sanitization and validation of input data submitted through frontend admin forms before it is rendered back to users or stored for later display. When an attacker submits a form field that accepts arbitrary HTML or JavaScript content, the application fails to properly encode special characters such as angle brackets, quotes, and ampersands. Consequently, when this untrusted data is retrieved from storage and displayed on a web page, it is interpreted by the browser not as plain text but as executable code. This failure in input validation allows an attacker to inject scripts that run with the privileges of the victim user. If the affected application handles sensitive administrative tasks or if users have elevated permissions within the platform, this can lead to severe security compromises including session hijacking, where the attacker steals authentication cookies and gains unauthorized access to the victim's account, or credential theft by capturing login information entered into compromised forms.
From an operational perspective, the impact of this vulnerability extends beyond simple defacement or minor annoyances. Stored XSS attacks are particularly dangerous in administrative interfaces because they can be used to perform actions on behalf of authenticated users without their knowledge. An attacker could manipulate the application's behavior by injecting scripts that interact with the Document Object Model (DOM) of the page, effectively allowing them to change settings, delete data, or exfiltrate sensitive information stored within the application interface. Furthermore, if the administrative console is accessed from a trusted network segment, this vulnerability can serve as an initial foothold for further lateral movement within an organization's infrastructure. The presence of such a flaw indicates a broader issue in the software development lifecycle regarding secure coding practices and input handling protocols, suggesting that other parts of the application may also be susceptible to similar injection-based attacks if not rigorously audited.
To mitigate this vulnerability, immediate remediation should focus on upgrading the DynamiApps Frontend Admin plugin to version 3.30.2 or later, where the developers have presumably implemented proper input sanitization and output encoding mechanisms. For organizations unable to upgrade immediately due to compatibility constraints, compensating controls must be deployed at the infrastructure level. Web Application Firewalls (WAFs) can be configured with rulesets specifically designed to detect and block common XSS payloads, such as script tags or event handlers like onerror or onload attributes, within HTTP request parameters. Additionally, implementing Content Security Policy headers is a critical defense-in-depth strategy that restricts the sources from which scripts can be loaded and executed by the browser, thereby neutralizing many stored XSS attacks even if they are successfully injected into the database. Developers should also ensure that all future updates adhere to OWASP guidelines for input validation, ensuring that data is validated against strict allowlists on the server side before processing and encoded appropriately based on the context in which it will be rendered within HTML structures.