CVE-2026-19615 in Admin and Site Enhancements Plugin
Summary
by MITRE • 08/20/2026
The Admin and Site Enhancements (ASE) WordPress plugin before 9.0.1 does not sanitise uploaded SVG files on every route it accepts them through, allowing users with a role the site owner granted upload access to store a file containing JavaScript which then executes in the browser of anyone who opens it.
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Analysis
by VulDB Data Team • 08/20/2026
The vulnerability identified within the Admin and Site Enhancements (ASE) WordPress plugin prior to version 9.0.1 represents a critical failure in input validation, specifically concerning the handling of Scalable Vector Graphics files. This flaw is categorized under CWE-436, which denotes interpretation ambiguity, or more accurately CWE-20, improper input sanitization, as the application fails to adequately filter malicious content embedded within ostensibly benign file types. The core technical issue lies in the plugin's upload mechanism, which accepts SVG files through multiple entry points without applying consistent and rigorous security checks across all routes. Unlike standard image formats such as JPEG or PNG, SVG is an XML-based vector format that supports scripting capabilities via JavaScript. When a server processes an uploaded SVG file, it often treats it similarly to HTML content if the MIME type is correctly identified by the browser, thereby allowing any embedded script tags to execute within the context of the user's session.
The operational impact of this vulnerability is severe because it facilitates Stored Cross-Site Scripting attacks against users with elevated privileges or those granted specific upload permissions. An attacker who possesses a valid account on the WordPress site can craft an SVG file containing malicious JavaScript payloads and upload it through any of the vulnerable routes exposed by the ASE plugin. Once stored, these files are not merely static assets; they become active vectors for attack whenever another user accesses them. This could occur when an administrator views uploaded media in the dashboard or if a public-facing page renders the image. The execution context is particularly dangerous because it runs with the privileges of the victim's browser session, potentially allowing the attacker to steal administrative cookies, perform actions on behalf of the victim, deface websites, or redirect users to phishing sites. This aligns closely with MITRE ATT&CK technique T1059.007, which covers JavaScript execution in web browsers, and highlights a significant risk to data integrity and confidentiality within WordPress environments that rely heavily on user-generated content.
Mitigation strategies must prioritize immediate remediation through software updates alongside defensive coding practices for developers maintaining similar systems. The primary defense is upgrading the Admin and Site Enhancements plugin to version 9.0.1 or later, where the vendor has presumably implemented stricter validation logic. For environments unable to update immediately, administrators should restrict file upload permissions to trusted users only and disable SVG uploads entirely if they are not strictly required for business operations. From a development perspective, it is essential to implement allow-listing rather than deny-listing when validating uploaded files. This involves checking the MIME type against a strict list of safe types and ensuring that any XML-based content like SVGs is sanitized using libraries specifically designed to strip executable scripts while preserving visual elements. Additionally, setting appropriate Content Security Policy headers can help mitigate the impact by restricting where scripts are allowed to execute, thereby reducing the effectiveness of client-side attacks even if input validation fails.