CVE-2025-26987: Dynamiapps Frontend Admin XSS Flaw

CVE-2025-26987 Overview

CVE-2025-26987 is a reflected Cross-Site Scripting (XSS) vulnerability in the Frontend Admin by DynamiApps WordPress plugin, developed by Shabti Kaplan. The flaw affects all plugin versions up to and including 3.25.17. The vulnerability results from improper neutralization of user-supplied input during web page generation, classified as [CWE-79]. Attackers can craft malicious links that execute arbitrary JavaScript in the browser of any user who clicks them. Successful exploitation requires user interaction and can lead to session hijacking, credential theft, or unauthorized actions performed in the victim's WordPress context.

Critical Impact
Attackers can execute arbitrary JavaScript in a victim's browser session by tricking them into clicking a crafted link, potentially compromising authenticated WordPress users including administrators.

Affected Products

DynamiApps Frontend Admin (acf-frontend-form-element) WordPress plugin
All versions from initial release through 3.25.17
WordPress sites using the Frontend Admin by DynamiApps plugin

Discovery Timeline

2025-02-25 - CVE-2025-26987 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-26987

Vulnerability Analysis

The Frontend Admin by DynamiApps plugin fails to properly sanitize and escape user-controlled input before reflecting it back into HTML responses. This flaw enables reflected XSS attacks against users of affected WordPress sites. The vulnerability is exploitable over the network without authentication, but requires user interaction such as clicking a crafted URL. Because the attack scope is changed, injected scripts can affect resources beyond the vulnerable component. The EPSS score of 0.286% (20.7th percentile) indicates a low but non-zero probability of exploitation activity.

Root Cause

The underlying issue stems from missing output encoding and insufficient input sanitization within the plugin's request handling logic. User-supplied parameters flow into HTML output without contextual escaping, allowing attacker-controlled markup and JavaScript to execute in the browser. This class of defect is tracked as [CWE-79] — Improper Neutralization of Input During Web Page Generation.

Attack Vector

An attacker constructs a URL containing a malicious JavaScript payload in a vulnerable request parameter. The attacker delivers this URL through phishing emails, social media, or malicious websites. When a victim clicks the link, the vulnerable endpoint reflects the payload into the response. The browser then executes the script in the context of the target WordPress domain, giving the attacker access to cookies, session tokens, and DOM content available to the victim. See the Patchstack advisory for further technical context.

Detection Methods for CVE-2025-26987

Indicators of Compromise

HTTP requests to Frontend Admin plugin endpoints containing URL-encoded <script>, onerror=, onload=, or javascript: payloads in query parameters.
Unusual referrer headers pointing to external phishing domains directing traffic to /wp-admin/ or Frontend Admin plugin URLs.
Web server access logs showing reflected parameter values that include HTML tags or JavaScript event handlers.
Reports from users of unexpected pop-ups, redirects, or session anomalies after clicking WordPress-related links.

Detection Strategies

Deploy a web application firewall (WAF) with signatures for reflected XSS patterns targeting WordPress plugin parameters.
Review WordPress plugin inventories to identify installations of Frontend Admin by DynamiApps at or below version 3.25.17.
Correlate authentication events with anomalous outbound requests from administrator sessions.

Monitoring Recommendations

Enable verbose HTTP request logging on WordPress hosts and forward logs to a centralized analytics platform.
Alert on requests containing common XSS payload signatures such as <script, %3Cscript, or onerror=.
Monitor administrator account activity for unexpected content changes, new user creation, or plugin modifications.

How to Mitigate CVE-2025-26987

Immediate Actions Required

Identify all WordPress instances running Frontend Admin by DynamiApps and confirm plugin version through the WordPress admin dashboard.
Update the plugin to a version newer than 3.25.17 as soon as a fixed release is available from the vendor.
Restrict administrative access to trusted networks and enforce multi-factor authentication for WordPress administrators.
Inform users about phishing risks and instruct them to avoid clicking untrusted links referencing the site.

Patch Information

At the time of publication, the vulnerability affects all versions up to and including 3.25.17. Site operators should monitor the Patchstack advisory and the DynamiApps plugin repository for a patched release, and apply updates immediately upon availability.

Workarounds

Deactivate the Frontend Admin by DynamiApps plugin until a patched version is released if it is not business-critical.
Deploy a WAF rule to block requests containing HTML tags or JavaScript event handlers in query parameters targeting the plugin's endpoints.
Enforce a strict Content Security Policy (CSP) that disallows inline scripts and restricts script sources to trusted origins.

bash

# Example WAF rule (ModSecurity) to block reflected XSS payloads
SecRule ARGS "@rx (?i)(<script|onerror=|onload=|javascript:)" \
    "id:1002687,phase:2,deny,status:403,log,\
    msg:'Potential reflected XSS targeting Frontend Admin plugin (CVE-2025-26987)'"