CVE-2025-58887: Course Booking Platform Stored XSS Vulnerability

CVE-2025-58887 Overview

CVE-2025-58887 is a stored cross-site scripting (XSS) vulnerability [CWE-79] in the Course Booking Platform WordPress plugin developed by andré martin - it solutions & research UG. The flaw affects all plugin versions up to and including 1.0.0. An authenticated attacker with low privileges can inject persistent JavaScript payloads that execute in the browser of any user who views the affected page. The scope-changing nature of the vulnerability allows the injected script to affect resources beyond the vulnerable component. Exploitation requires user interaction to trigger the payload.

Critical Impact

Stored XSS enables session hijacking, credential theft, and administrative account takeover across WordPress sites running the vulnerable plugin.

Affected Products

• Course Booking Platform WordPress plugin (course-booking-platform) versions up to and including 1.0.0
• Vendor: Course Finder | andré martin - it solutions & research UG
• WordPress installations with the plugin activated

Discovery Timeline

• 2025-09-05 - CVE-2025-58887 published to NVD
• 2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-58887

Vulnerability Analysis

The Course Booking Platform plugin fails to properly neutralize user-supplied input before rendering it in generated web pages. Attackers with contributor-level or higher access can submit crafted input containing JavaScript, which the plugin stores and later serves to visitors without sanitization or output encoding. When a victim loads the affected page, the browser executes the attacker's script in the site's origin context.

Because the vulnerability is stored rather than reflected, a single injection persists until removed. The scope change indicates the payload can access resources outside the vulnerable component, such as authenticated administrator sessions or other WordPress subsystems.

Root Cause

The root cause is missing input validation and output encoding in the plugin's course booking data handling. User-controlled fields accept HTML and script content without sanitization functions such as wp_kses(), esc_html(), or esc_attr(). WordPress provides these APIs specifically to prevent [CWE-79], but the plugin does not apply them to the affected input paths.

Attack Vector

An authenticated attacker submits a booking or course-related form field containing a JavaScript payload. The plugin persists the payload to the WordPress database. When an administrator or other user views the resulting page in the WordPress dashboard or on the public-facing site, the browser renders and executes the script. The attacker can then steal session cookies, perform actions on behalf of the victim, or pivot to further compromise of the WordPress installation.

See the Patchstack Vulnerability Report for additional technical detail.

Detection Methods for CVE-2025-58887

Indicators of Compromise

• Unexpected <script>, <iframe>, or event-handler attributes (for example onerror=, onload=) stored in the wp_posts or plugin-specific database tables
• Outbound requests from administrator browsers to attacker-controlled domains shortly after visiting course booking pages
• New WordPress administrator accounts or modified user roles without a corresponding audit trail
• Modifications to plugin or theme files timestamped after suspicious dashboard visits

Detection Strategies

• Review WordPress audit logs for booking submissions containing HTML or JavaScript syntax from low-privileged users
• Scan the WordPress database for stored payloads matching common XSS patterns in Course Booking Platform tables
• Deploy a Web Application Firewall (WAF) rule set that flags script tags and JavaScript URIs in POST parameters targeting the plugin's endpoints

Monitoring Recommendations

• Enable request logging for all administrative pages and correlate with unusual JavaScript execution telemetry from endpoint agents
• Alert on browser processes making unexpected network connections after loading WordPress admin URLs
• Monitor WordPress user role changes and plugin file modifications for signs of post-exploitation activity

How to Mitigate CVE-2025-58887

Immediate Actions Required

• Deactivate the Course Booking Platform plugin until a patched release is confirmed available
• Audit existing booking records and remove any entries containing HTML or JavaScript content
• Rotate credentials and invalidate active sessions for administrator accounts that accessed affected pages

Patch Information

No fixed version has been published as of the last NVD update. The vulnerability affects all versions through 1.0.0. Monitor the Patchstack advisory and the plugin's WordPress.org repository for a security release.

Workarounds

• Remove the plugin from production WordPress installations until a patch is released
• Restrict contributor and author role assignments to trusted users only, reducing the pool of accounts able to trigger the injection
• Deploy a WAF or WordPress security plugin configured to strip script tags and JavaScript event handlers from form submissions targeting the plugin
• Apply a strict Content Security Policy (CSP) that disallows inline script execution to reduce impact if a payload is served

# Example Content Security Policy header for WordPress (add via .htaccess or web server config)
Header set Content-Security-Policy "default-src 'self'; script-src 'self'; object-src 'none'; base-uri 'self'; frame-ancestors 'self'"