CVE-2025-60124: Simple Colorbox Plugin XSS Vulnerability

CVE-2025-60124 Overview

CVE-2025-60124 is a stored cross-site scripting (XSS) vulnerability in the Ryan Hellyer Simple Colorbox plugin for WordPress. The flaw affects all plugin versions up to and including 1.6.1. Authenticated attackers with low privileges can inject malicious scripts that persist in the application and execute in the browsers of other users. The vulnerability is tracked under CWE-79: Improper Neutralization of Input During Web Page Generation.

Critical Impact
Stored XSS allows attackers to hijack sessions, steal credentials, and perform actions in the context of authenticated administrators visiting affected pages.

Affected Products

Ryan Hellyer Simple Colorbox WordPress plugin
All versions from n/a through 1.6.1
WordPress sites with the simple-colorbox plugin installed and activated

Discovery Timeline

2025-09-26 - CVE-2025-60124 published to the National Vulnerability Database (NVD)
2026-10-11 - Last updated in NVD database

Technical Details for CVE-2025-60124

Vulnerability Analysis

The Simple Colorbox plugin fails to properly neutralize user-supplied input before rendering it within web page output. An authenticated user with contributor-level privileges or higher can submit crafted input containing HTML or JavaScript payloads. The plugin stores this input and later reflects it unsanitized when the affected page is rendered.

Because the payload persists in the database, every visitor who loads the compromised page executes the injected script in their browser session. The scope-changed impact (S:C in the CVSS vector) indicates the exploit crosses security boundaries, affecting users beyond the attacker's own context.

Root Cause

The root cause is missing or insufficient output encoding on data persisted through the plugin's input handling routines. WordPress provides sanitization helpers such as wp_kses_post() and escaping helpers like esc_html() and esc_attr(), but the vulnerable code paths in versions through 1.6.1 do not apply them consistently to plugin-controlled fields.

Attack Vector

Exploitation requires network access to the WordPress site, low-level authenticated privileges, and user interaction from the victim who loads the affected page. An attacker authenticates to a vulnerable site, submits an input containing a JavaScript payload through a plugin field, and waits for an administrator or other privileged user to view the content. The script then executes with the victim's session context, enabling cookie theft, forced administrative actions, or redirection to attacker-controlled infrastructure. See the Patchstack Vulnerability Report for additional technical context.

Detection Methods for CVE-2025-60124

Indicators of Compromise

Presence of <script>, onerror=, onload=, or javascript: strings in WordPress post content, custom fields, or wp_options entries related to the Simple Colorbox plugin
Unexpected outbound HTTP requests from administrator browser sessions to unknown domains
New or modified administrator accounts created shortly after admin page views
Browser console errors or unexpected redirects when loading pages that embed Simple Colorbox output

Detection Strategies

Audit WordPress database tables for stored plugin content containing HTML event handlers or script tags
Deploy a Web Application Firewall (WAF) rule set that inspects POST parameters for XSS payload patterns
Review web server access logs for POST requests to plugin endpoints followed by GET requests from privileged session cookies
Use static analysis against the plugin source to identify output paths lacking esc_* escaping functions

Monitoring Recommendations

Enable WordPress audit logging to track content changes made by contributor and author roles
Monitor Content Security Policy (CSP) violation reports for inline script execution attempts
Alert on administrator session activity originating from unusual geolocations or user agents immediately after low-privilege user content submissions

How to Mitigate CVE-2025-60124

Immediate Actions Required

Deactivate and remove the Simple Colorbox plugin if a patched version is not available for your installation
Audit all existing plugin-managed content for injected scripts and remove malicious payloads
Rotate credentials for any administrator accounts that accessed affected pages while the plugin was vulnerable
Restrict contributor and author account creation and review existing low-privilege accounts for suspicious activity

Patch Information

At the time of publication, the Patchstack advisory lists all versions up to and including 1.6.1 as affected. Review the Patchstack Vulnerability Report for current patch availability and apply any released update immediately. If no patched release is available, uninstall the plugin.

Workarounds

Remove the Simple Colorbox plugin until a vendor patch is available
Deploy a WAF with managed WordPress rule sets to block common XSS payload patterns at the perimeter
Enforce a strict Content Security Policy that disallows inline scripts and restricts script sources to trusted origins
Limit contributor and author roles to trusted users, and require multi-factor authentication for all WordPress accounts

bash

# Example: deactivate the vulnerable plugin via WP-CLI
wp plugin deactivate simple-colorbox
wp plugin delete simple-colorbox

# Example CSP header to mitigate inline script execution
# Add to web server configuration (nginx)
add_header Content-Security-Policy "default-src 'self'; script-src 'self'; object-src 'none'; base-uri 'self';" always;