CVE-2025-58787 Overview
CVE-2025-58787 is a stored Cross-Site Scripting (XSS) vulnerability in the Themify Popup WordPress plugin developed by themifyme. The flaw affects all versions of Themify Popup up to and including 1.4.2. Attackers with low-privileged authenticated access can inject persistent JavaScript payloads that execute in the browsers of users who view affected pages. The vulnerability is categorized under [CWE-79] for improper neutralization of input during web page generation. Successful exploitation requires user interaction and can compromise session data, redirect visitors, or perform actions on behalf of the victim within the WordPress site.
Critical Impact
Authenticated contributors can inject persistent JavaScript that runs in visitor and administrator browsers, enabling session theft and site manipulation.
Affected Products
- Themify Popup WordPress Plugin versions up to and including 1.4.2
- WordPress sites running the vulnerable themify-popup plugin
- Environments granting contributor-level or higher access to untrusted users
Discovery Timeline
- 2025-09-05 - CVE-2025-58787 published to the National Vulnerability Database (NVD)
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-58787
Vulnerability Analysis
The Themify Popup plugin fails to properly neutralize user-supplied input before rendering it within generated web pages. An authenticated attacker with low privileges can persist malicious HTML or JavaScript through plugin-controlled fields. When another user loads a page containing the stored payload, the script executes in that user's browser under the site's origin.
The scope change indicator in the advisory reflects that injected scripts can impact resources beyond the vulnerable component, including administrator sessions and connected browser contexts. User interaction is required, typically the victim visiting a page that renders the malicious content.
Root Cause
The root cause is missing or insufficient output encoding and input sanitization in the plugin's popup content handling routines. Data submitted through the plugin interface is stored in the WordPress database and later echoed into page output without escaping HTML control characters. This aligns with [CWE-79], Improper Neutralization of Input During Web Page Generation.
Attack Vector
Exploitation follows a typical stored XSS pattern. An attacker with a valid contributor or higher WordPress account submits a popup configuration containing a script payload through the plugin's input fields. The payload is written to the database. When an editor, administrator, or site visitor later views a page that renders the popup, the browser parses and executes the injected script. See the Patchstack Vulnerability Report for advisory details.
No verified public exploit code is available. The vulnerability mechanism follows standard stored XSS behavior against a WordPress plugin data store.
Detection Methods for CVE-2025-58787
Indicators of Compromise
- Unexpected <script>, <iframe>, or event-handler attributes (onerror, onload) stored in WordPress database tables associated with Themify Popup configuration.
- Outbound browser requests from administrator sessions to unfamiliar domains shortly after loading pages containing popups.
- New or modified WordPress administrator accounts created following contributor logins.
Detection Strategies
- Audit the wp_posts, wp_postmeta, and plugin-specific tables for HTML tags or JavaScript keywords in popup content fields.
- Review web server access logs for contributor accounts submitting large or encoded payloads to admin-ajax.php or plugin endpoints.
- Deploy a web application firewall rule set that flags stored XSS patterns targeting WordPress plugin admin routes.
Monitoring Recommendations
- Monitor WordPress user role changes and content submissions from non-administrative accounts.
- Alert on Content Security Policy (CSP) report-only violations that indicate injected inline scripts.
- Track plugin version inventory across managed WordPress installations to identify hosts running Themify Popup 1.4.2 or earlier.
How to Mitigate CVE-2025-58787
Immediate Actions Required
- Update Themify Popup to a version later than 1.4.2 as soon as the vendor patch is available through the WordPress plugin repository.
- Restrict contributor and author accounts to trusted users and review recent role assignments.
- Inspect existing popup content for stored JavaScript or HTML payloads and remove any suspicious entries.
Patch Information
Refer to the Patchstack Vulnerability Report for the current fixed version and vendor guidance. Apply the update through the WordPress admin plugin manager or via WP-CLI. Verify the plugin version after update to confirm remediation.
Workarounds
- Deactivate the Themify Popup plugin until a patched version is installed.
- Enforce a strict Content Security Policy that blocks inline scripts and disallows untrusted script sources.
- Deploy WordPress hardening plugins or a web application firewall to filter XSS payloads submitted to plugin endpoints.
# Configuration example: update via WP-CLI and verify
wp plugin update themify-popup
wp plugin get themify-popup --field=version
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
