CVE-2025-8015: WP Shortcodes Ultimate XSS Vulnerability

CVE-2025-8015 Overview

CVE-2025-8015 is a stored Cross-Site Scripting (XSS) vulnerability [CWE-79] in the WP Shortcodes Plugin — Shortcodes Ultimate for WordPress. The flaw affects all versions up to and including 7.4.2. It stems from insufficient input sanitization and output escaping on an uploaded image's Title and Slide link fields. Authenticated attackers with Author-level access or higher can inject arbitrary JavaScript into pages. The injected scripts execute in the browser of any user who visits an affected page, enabling session theft, forced redirects, or administrative actions performed on behalf of higher-privileged users.

Critical Impact
An Author-level account can plant persistent JavaScript that executes against site administrators and visitors, enabling account takeover and site compromise.

Affected Products

WP Shortcodes Plugin — Shortcodes Ultimate for WordPress, all versions through 7.4.2
WordPress installations that grant Author-level access or above to untrusted users
Sites using the plugin's image and slider shortcodes with user-supplied Title or Slide link metadata

Discovery Timeline

2025-07-22 - CVE-2025-8015 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-8015

Vulnerability Analysis

The vulnerability is a stored XSS issue triggered through image metadata handled by the Shortcodes Ultimate plugin. When an authenticated user uploads an image and populates the Title or Slide link fields, the plugin stores the values without adequate sanitization. On rendering, the values are inserted into page output without proper escaping, so script payloads execute in the browser of any user who loads the page.

Because the payload is persisted in the database and served to every visitor of the affected page, exploitation does not require any additional interaction from the victim beyond visiting the page. The scope is changed under CVSS, reflecting that a low-privileged plugin user can affect the browsing context of higher-privileged administrators.

Root Cause

The root cause is missing input validation and output escaping on the Title and Slide link attributes of the plugin's image handlers. WordPress provides sanitization primitives such as sanitize_text_field(), esc_url(), esc_attr(), and esc_html(), but the affected shortcode render paths did not apply them consistently. The plugin author addressed the flaw in the WordPress plugin repository changeset for version 7.4.3.

Attack Vector

Exploitation requires an authenticated account with Author-level capabilities or above. The attacker uploads an image through the Shortcodes Ultimate interface and injects a JavaScript payload into the Title or Slide link field. The payload is stored in WordPress post metadata. When any user, including administrators, visits a page rendering that shortcode, the browser executes the script in the site's origin, enabling cookie theft, CSRF-style actions, or DOM manipulation. See the CleanTalk CVE-2025-8015 Analysis and Wordfence Vulnerability Report for reproduction details.

No verified proof-of-concept code is published in this advisory. Technical details are described in prose only.

Detection Methods for CVE-2025-8015

Indicators of Compromise

Unexpected <script>, onerror, onload, or javascript: strings stored in image post metadata such as _wp_attachment_image_alt, image Title fields, or slider Slide link fields
Outbound browser requests from admin sessions to unknown domains shortly after loading a page containing a Shortcodes Ultimate slider or image shortcode
New administrator accounts, altered user roles, or unexpected plugin installs performed shortly after an admin viewed a page with attacker-controlled shortcode content

Detection Strategies

Scan the wp_postmeta and wp_posts tables for HTML event handlers or javascript: URLs within fields associated with attachments used by Shortcodes Ultimate
Review Author-level activity in WordPress audit logs for image uploads followed by shortcode edits containing unusual characters or encoded payloads
Deploy a Web Application Firewall (WAF) rule to flag POST requests to admin-ajax.php or the media upload endpoints that carry HTML tags in Title or link fields

Monitoring Recommendations

Enable a WordPress activity logging plugin and forward events to a centralized log platform for correlation with web server access logs
Alert on privilege changes, plugin installs, and administrative session anomalies that follow content edits by non-administrator users
Monitor Content Security Policy (CSP) violation reports for inline script executions on pages served by the affected plugin

How to Mitigate CVE-2025-8015

Immediate Actions Required

Update the Shortcodes Ultimate plugin to version 7.4.3 or later on all WordPress instances
Audit existing image Title and Slide link metadata for stored payloads and remove any script content before restoring pages
Review and, where possible, reduce the number of accounts holding Author or higher capabilities

Patch Information

The plugin author released a fix in the WordPress plugin repository. See the WordPress Plugin Changeset Note for the corrected sanitization and escaping logic. The fixed release is version 7.4.3. Additional analysis is available in the Wordfence Vulnerability Report.

Workarounds

Restrict Author-level and higher access to trusted users until the plugin is patched
Temporarily disable Shortcodes Ultimate image and slider shortcodes on pages editable by low-trust roles
Deploy a strict Content Security Policy that blocks inline script execution to limit the impact of stored payloads

bash

# Configuration example: enforce a restrictive CSP via .htaccess
Header set Content-Security-Policy "default-src 'self'; script-src 'self'; object-src 'none'; base-uri 'self'; frame-ancestors 'self'"