CVE-2025-22506 Overview
CVE-2025-22506 is a stored Cross-Site Scripting (XSS) vulnerability in the Smart Agenda smart-agenda-prise-de-rendez-vous-en-ligne WordPress plugin. The flaw stems from improper neutralization of user input during web page generation [CWE-79]. Attackers can chain a Cross-Site Request Forgery (CSRF) flow with stored XSS to inject persistent malicious scripts into administrative contexts. The vulnerability affects all plugin versions up to and including 4.7. Successful exploitation requires user interaction but no authentication, and the impact crosses security scopes, allowing scripts to execute against other users of the affected WordPress site.
Critical Impact
Attackers can persist arbitrary JavaScript in the WordPress site, hijack administrator sessions, and pivot to broader site compromise once an authenticated user is tricked into triggering the CSRF payload.
Affected Products
- Smart Agenda smart-agenda-prise-de-rendez-vous-en-ligne WordPress plugin
- All versions from initial release through 4.7
- WordPress sites with the vulnerable plugin installed and activated
Discovery Timeline
- 2025-01-13 - CVE-2025-22506 published to NVD
- 2026-04-23 - Last updated in NVD database
Technical Details for CVE-2025-22506
Vulnerability Analysis
The Smart Agenda plugin fails to properly sanitize and encode user-supplied input before rendering it within generated web pages. The flaw is compounded by a missing or insufficient CSRF protection on the affected request handler. An unauthenticated attacker crafts a malicious request that, when triggered by an authenticated administrator visiting an attacker-controlled page, stores attacker-supplied JavaScript in the plugin's persistent storage. Because the payload is stored, it executes for every subsequent visitor to the affected administrative or front-end view. The changed scope indicates that the injected script can affect components beyond the vulnerable plugin itself, including the broader WordPress administrative interface.
Root Cause
The root cause is twofold. First, the plugin does not enforce anti-CSRF tokens (WordPress nonces) on state-changing requests that accept user input. Second, the plugin renders that stored input back into HTML contexts without applying output encoding through functions such as esc_html(), esc_attr(), or wp_kses(). This combination allows raw HTML and <script> tags supplied through the CSRF-triggered request to persist in the database and execute in victim browsers.
Attack Vector
The attack vector is network-based and requires user interaction. An attacker hosts a malicious page containing an auto-submitting form or fetch() call that targets the vulnerable Smart Agenda endpoint. When a logged-in WordPress user, typically an administrator, visits the attacker-controlled page, the browser submits the forged request with the user's authenticated session cookies. The injected payload is stored by the plugin and rendered to subsequent viewers, executing JavaScript in their browser context. See the Patchstack WordPress Vulnerability advisory for the technical disclosure.
Detection Methods for CVE-2025-22506
Indicators of Compromise
- Unexpected <script>, <iframe>, or event-handler attributes stored within Smart Agenda plugin data tables or option entries
- WordPress administrator sessions exhibiting unsolicited outbound requests to unknown domains shortly after viewing plugin-rendered pages
- New or modified administrator accounts created shortly after rendering Smart Agenda views
- Browser console errors or Content Security Policy violations originating from plugin-served pages
Detection Strategies
- Review the WordPress database for Smart Agenda records containing HTML control characters such as <, >, or javascript: URI schemes
- Inspect web server access logs for POST requests to Smart Agenda endpoints lacking a valid Referer header consistent with the site origin
- Deploy a Web Application Firewall (WAF) rule that flags requests to plugin endpoints missing WordPress nonce parameters
Monitoring Recommendations
- Enable WordPress audit logging to capture plugin option changes and post metadata modifications
- Monitor for anomalous administrator activity such as theme or plugin installs occurring after Smart Agenda page views
- Forward web server and WordPress logs to a centralized SIEM for correlation against known XSS payload signatures
How to Mitigate CVE-2025-22506
Immediate Actions Required
- Deactivate the Smart Agenda plugin until a patched release is verified and applied
- Audit existing plugin data for stored HTML or JavaScript and remove any unauthorized payloads
- Force password resets and session invalidation for all administrator accounts that may have interacted with the plugin
- Apply a temporary WAF rule blocking script tags and event-handler attributes in requests to plugin endpoints
Patch Information
At the time of NVD publication, the vendor advisory tracked by Patchstack indicates the vulnerability affects all versions up to and including 4.7. Administrators should consult the Patchstack advisory and the plugin's WordPress.org page for the latest fixed release and upgrade as soon as one is available.
Workarounds
- Restrict access to WordPress administrative pages by IP allowlist while the plugin remains vulnerable
- Enforce a strict Content Security Policy that disallows inline scripts on WordPress admin and Smart Agenda pages
- Require administrators to use a dedicated browser profile for WordPress management to limit CSRF exposure from third-party browsing
# Example Apache configuration to enforce a strict Content Security Policy
Header set Content-Security-Policy "default-src 'self'; script-src 'self'; object-src 'none'; base-uri 'self'; frame-ancestors 'self'"
Header set X-Content-Type-Options "nosniff"
Header set Referrer-Policy "strict-origin-when-cross-origin"
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
