CVE-2025-48231 Overview
CVE-2025-48231 is a stored Cross-Site Scripting (XSS) vulnerability affecting the codepeople Booking Calendar Contact Form plugin for WordPress. The flaw results from improper neutralization of input during web page generation, classified under [CWE-79]. All plugin versions up to and including 1.2.58 are affected. An authenticated attacker with low privileges can inject malicious JavaScript that executes in the browsers of users who view the affected pages. Because the injected payload persists in the application, the vulnerability can target administrators and other site visitors across sessions.
Critical Impact
Stored XSS in Booking Calendar Contact Form (≤ 1.2.58) allows attackers to execute scripts in victim browsers, enabling session theft, account takeover, and administrative action abuse.
Affected Products
- codepeople Booking Calendar Contact Form plugin for WordPress
- All versions from n/a through 1.2.58
- WordPress sites running the vulnerable plugin configuration
Discovery Timeline
- 2025-07-04 - CVE-2025-48231 published to the National Vulnerability Database
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-48231
Vulnerability Analysis
The vulnerability sits in the plugin's input handling path during web page generation. User-supplied input is reflected or persisted into HTML output without proper sanitization or output encoding. An attacker with contributor-level or similar access can store crafted payloads that execute as JavaScript inside the Document Object Model (DOM) of any user who later renders the affected view. Successful exploitation requires user interaction, such as visiting a page or opening a booking record, which triggers the stored payload.
Because the issue produces a scope change, injected scripts can act beyond the vulnerable component and interact with the broader WordPress administrative context. Attackers typically chain stored XSS with session cookie theft, cross-site request forgery (CSRF) actions against wp-admin, or plugin and theme manipulation to escalate privileges.
Root Cause
The root cause is improper neutralization of input during web page generation [CWE-79]. The plugin fails to apply contextual output encoding, such as esc_html(), esc_attr(), or wp_kses_post(), before rendering user-controlled data into HTML. Input validation on write paths is likewise insufficient to strip or reject executable markup.
Attack Vector
Exploitation occurs over the network through the WordPress application interface. An authenticated attacker submits booking or form data containing an HTML or JavaScript payload. The payload is stored by the plugin and later rendered to administrators, staff, or visitors who open the booking view. See the Patchstack XSS Vulnerability Report for additional technical context.
Detection Methods for CVE-2025-48231
Indicators of Compromise
- Booking records, calendar entries, or form submissions containing HTML tags such as <script>, <svg>, <img onerror=...>, or javascript: URIs.
- Unexpected outbound requests from administrator browsers to attacker-controlled domains shortly after viewing booking content.
- New or modified WordPress administrator accounts, plugins, or theme files following access to the vulnerable plugin pages.
Detection Strategies
- Review the plugin's database tables and wp_options entries for stored payloads matching common XSS patterns.
- Inspect web server access logs for POST requests to Booking Calendar Contact Form endpoints that include encoded script fragments.
- Correlate browser Content Security Policy (CSP) violation reports with WordPress session activity to identify in-browser script execution.
Monitoring Recommendations
- Alert on administrator session anomalies, such as new IP addresses, user-agent changes, or privilege changes immediately after viewing booking data.
- Monitor file integrity on wp-content/plugins/booking-calendar-contact-form/ and core WordPress directories for unauthorized modifications.
- Forward WordPress audit logs and web server logs to a centralized analytics platform for correlation across sessions and endpoints.
How to Mitigate CVE-2025-48231
Immediate Actions Required
- Upgrade Booking Calendar Contact Form to a version later than 1.2.58 as soon as the vendor publishes a fixed release.
- Audit all existing booking entries and form submissions for stored HTML or script content and remove malicious payloads.
- Rotate credentials and invalidate active sessions for WordPress administrators who may have viewed attacker-controlled booking data.
Patch Information
At the time of publication, the Patchstack advisory lists the vulnerability as present through version 1.2.58. Administrators should consult the Patchstack XSS Vulnerability Report and the vendor's plugin page for the latest fixed version and apply it across all WordPress instances.
Workarounds
- Restrict access to booking submission forms using authentication, CAPTCHA, or IP allowlisting to reduce attacker reach.
- Deploy a Web Application Firewall (WAF) rule to block requests containing <script>, event handler attributes, or javascript: URIs on plugin endpoints.
- Enforce a strict Content Security Policy (CSP) on WordPress administrative pages to limit inline script execution.
- Temporarily deactivate the plugin on high-value sites until a patched version is installed.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
