CVE-2025-31393 Overview
CVE-2025-31393 is a Cross-Site Request Forgery (CSRF) vulnerability in the Social Bookmarking RELOADED WordPress plugin developed by vfvalent. The flaw affects all versions up to and including 3.18 and enables stored Cross-Site Scripting (XSS) when an authenticated user is tricked into executing a forged request. The vulnerability is classified under CWE-352 and stems from missing or insufficient CSRF token validation on state-changing plugin actions. Successful exploitation persists malicious JavaScript in the WordPress database, which executes in the browser of any user visiting the affected page.
Critical Impact
Attackers can persist arbitrary JavaScript in WordPress sites running the plugin, leading to session theft, admin account takeover, and pivoting against site visitors.
Affected Products
- vfvalent Social Bookmarking RELOADED plugin for WordPress
- All versions from n/a through 3.18
- WordPress sites with the social-bookmarking-reloaded plugin installed and active
Discovery Timeline
- 2025-04-09 - CVE-2025-31393 published to NVD
- 2026-04-23 - Last updated in NVD database
Technical Details for CVE-2025-31393
Vulnerability Analysis
The vulnerability chains two weaknesses: a CSRF flaw and a stored XSS sink. The plugin accepts state-changing requests without verifying a WordPress nonce or equivalent anti-CSRF token. An attacker hosts a malicious page that submits a forged POST request to the plugin endpoint. When an authenticated administrator visits this page, their browser submits the request with valid session cookies. The plugin then writes attacker-controlled input into persistent storage without sanitizing or encoding HTML and JavaScript. Each subsequent page render outputs the payload directly into the document, executing the script in the visitor's browser context.
Root Cause
The root cause is the absence of CSRF protection on form handlers that write user input to the database, compounded by missing output encoding. WordPress provides wp_nonce_field() and check_admin_referer() to mitigate CSRF, but the plugin does not enforce these checks on the vulnerable endpoint. The stored value is rendered into HTML without esc_html() or esc_attr(), producing the XSS sink.
Attack Vector
Exploitation requires user interaction. The attacker delivers a crafted link or embeds an auto-submitting form on a third-party page. When a logged-in administrator loads the page, the browser sends the forged request with cookies attached. The injected payload is then served to anyone viewing the affected plugin output. Because the scope is changed (S:C), the injected script can act against the entire WordPress origin, including administrative pages.
No public proof-of-concept exploit code is available for this vulnerability. Refer to the Patchstack WordPress Vulnerability Report for additional technical context.
Detection Methods for CVE-2025-31393
Indicators of Compromise
- Unexpected <script> tags, onerror=, or onload= attributes in plugin-managed content stored in the wp_options or wp_postmeta tables.
- Outbound HTTP requests from administrator browsers to unfamiliar domains shortly after visiting external links.
- New or modified administrator accounts created without a corresponding audit log entry.
Detection Strategies
- Audit WordPress database tables for HTML and JavaScript payloads inside fields owned by the social-bookmarking-reloaded plugin.
- Review web server access logs for POST requests to plugin endpoints lacking a valid _wpnonce parameter or referer header.
- Run WordPress security scanners that flag plugins with known CSRF and stored XSS advisories.
Monitoring Recommendations
- Enable file integrity monitoring on the wp-content/plugins/social-bookmarking-reloaded/ directory.
- Monitor administrator session activity for unusual navigation patterns or simultaneous logins from different IP addresses.
- Alert on creation of WordPress users with administrator or editor roles outside change-management windows.
How to Mitigate CVE-2025-31393
Immediate Actions Required
- Deactivate the Social Bookmarking RELOADED plugin until a vendor patch is verified and installed.
- Rotate all WordPress administrator passwords and invalidate active sessions using wp_logout_all_users or equivalent.
- Inspect database content managed by the plugin for stored payloads and remove malicious entries.
Patch Information
No fixed version is listed in the available advisory data. The vulnerability affects versions through 3.18 inclusive. Monitor the Patchstack advisory and the WordPress.org plugin repository for an updated release.
Workarounds
- Remove or replace the plugin with an actively maintained bookmarking alternative.
- Deploy a Web Application Firewall rule that requires a valid Referer header and WordPress nonce on plugin admin endpoints.
- Apply a Content Security Policy that restricts inline script execution to limit the impact of injected payloads.
# Disable the vulnerable plugin via WP-CLI until a patch is available
wp plugin deactivate social-bookmarking-reloaded
wp plugin delete social-bookmarking-reloaded
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
