CVE-2025-31473 Overview
CVE-2025-31473 is a stored Cross-Site Scripting (XSS) vulnerability in the WP Database Optimizer WordPress plugin by matthewprice1178. The flaw affects all plugin versions up to and including 1.2.1.3. Attackers with high-privilege access can inject persistent JavaScript payloads that execute in the browsers of other administrators or site visitors who load affected pages. The vulnerability is classified under [CWE-79], improper neutralization of input during web page generation.
Critical Impact
Authenticated attackers can store malicious scripts that execute across a scope change, enabling session theft, administrative account takeover, and defacement of WordPress dashboards.
Affected Products
- WP Database Optimizer plugin versions up to and including 1.2.1.3
- WordPress installations running the vulnerable plugin
- Any administrative user session interacting with malicious plugin output
Discovery Timeline
- 2025-03-28 - CVE-2025-31473 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-31473
Vulnerability Analysis
The WP Database Optimizer plugin fails to properly sanitize and escape user-supplied input before rendering it within WordPress-generated pages. Because the payload is persisted server-side, any subsequent page load that includes the tainted content executes the injected JavaScript in the victim's browser context.
Exploitation requires an authenticated account with elevated privileges and a user interaction step to trigger the payload. The scope-change property means the injected script can affect components beyond the vulnerable plugin, including the wider WordPress admin interface.
Successful exploitation yields limited but meaningful impact on confidentiality, integrity, and availability. Common outcomes include stealing administrator session cookies, performing actions on behalf of victims through the WordPress REST API, and modifying stored content across the site.
Root Cause
The root cause is missing output encoding on plugin-controlled data written into HTML contexts. WordPress provides sanitization helpers such as esc_html(), esc_attr(), and wp_kses(), but the plugin does not apply them consistently prior to echoing values back into the administrative interface.
Attack Vector
The attack requires network access to the WordPress site and an authenticated session with high privileges. The attacker submits a crafted payload through a plugin input field. The payload is stored in the database and later rendered without escaping when a legitimate user visits the affected page, triggering script execution in that user's session. See the Patchstack WordPress XSS Vulnerability advisory for additional technical context.
Detection Methods for CVE-2025-31473
Indicators of Compromise
- Unexpected <script>, onerror, or onload tags stored in wp_options, wp_postmeta, or plugin-specific database tables tied to WP Database Optimizer.
- Administrator sessions issuing REST API calls or configuration changes that do not correlate with legitimate user activity.
- New or modified administrator accounts created shortly after an admin loaded a plugin settings page.
Detection Strategies
- Review plugin configuration pages for stored HTML or JavaScript payloads and inspect database rows written by WP Database Optimizer.
- Enable a Content Security Policy (CSP) in report-only mode to surface inline script executions inside /wp-admin/.
- Correlate WordPress audit logs with web server access logs to identify suspicious POST requests to plugin endpoints from high-privilege accounts.
Monitoring Recommendations
- Monitor changes to WordPress user roles, especially privilege elevation events following administrator page visits.
- Alert on outbound HTTP requests from browsers loading /wp-admin/ that target unfamiliar external domains, indicating data exfiltration via injected script.
- Track plugin version inventory across managed WordPress sites and flag any deployment of WP Database Optimizer <= 1.2.1.3.
How to Mitigate CVE-2025-31473
Immediate Actions Required
- Update WP Database Optimizer to a version newer than 1.2.1.3 once a patched release is available from the maintainer.
- Audit administrator accounts and rotate credentials for any user who accessed the plugin during the exposure window.
- Inspect plugin-related database tables and remove any stored HTML or script content that was not entered by a legitimate operator.
Patch Information
No fixed version is listed in the NVD entry at the time of publication. Consult the Patchstack advisory for the current remediation status and any vendor-supplied patch.
Workarounds
- Deactivate and remove the WP Database Optimizer plugin until a patched release is confirmed.
- Restrict administrator access using IP allowlists or a web application firewall (WAF) rule set that blocks script tags in plugin request bodies.
- Enforce a strict Content Security Policy that disallows inline scripts within the /wp-admin/ interface to reduce the impact of stored XSS payloads.
# Configuration example: disable the plugin via WP-CLI pending a fix
wp plugin deactivate wp-database-optimizer
wp plugin delete wp-database-optimizer
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
