CVE-2025-31605 Overview
CVE-2025-31605 is a stored cross-site scripting (XSS) vulnerability in the WeblineIndia Welcome Popup plugin for WordPress. The flaw affects all plugin versions up to and including 1.0.10. It stems from improper neutralization of user-supplied input during web page generation, categorized under [CWE-79]. An authenticated attacker with high privileges can inject persistent JavaScript payloads that execute in the browsers of users who view affected pages. The issue was published to the National Vulnerability Database on March 31, 2025, and last modified on June 17, 2026.
Critical Impact
Stored XSS enables session hijacking, credential theft, and administrative account takeover through malicious script execution in a victim's browser.
Affected Products
- WeblineIndia Welcome Popup WordPress plugin versions through 1.0.10
- WordPress sites running the welcome-popup plugin
- Any browser session interacting with an infected popup instance
Discovery Timeline
- 2025-03-31 - CVE-2025-31605 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-31605
Vulnerability Analysis
The Welcome Popup plugin fails to sanitize input before rendering it in generated web pages. Attacker-controlled content persists in the WordPress database and is later served to site visitors and administrators. When the affected pages load, the injected script executes in the browser context of the WordPress site.
Successful exploitation can lead to session token theft, forced administrative actions through the current user's session, and redirection to attacker-controlled infrastructure. Because the payload is stored, every user who views the affected surface is exposed until the content is removed.
Root Cause
The plugin does not apply output escaping or input sanitization on fields rendered into the popup markup. WordPress provides functions such as esc_html(), esc_attr(), wp_kses(), and sanitize_text_field() for this purpose. Their absence allows raw HTML and JavaScript to persist in the rendered output.
Attack Vector
Exploitation requires an authenticated user with high privileges and user interaction to trigger the payload. The scope is changed, meaning script execution affects a security context beyond the vulnerable component. An attacker submits crafted content through the plugin's administrative interface, and the payload executes when another user renders the popup.
No verified proof-of-concept code is publicly available. See the Patchstack XSS Vulnerability Report for additional technical context.
Detection Methods for CVE-2025-31605
Indicators of Compromise
- Presence of <script> tags, event handlers such as onerror= or onload=, or javascript: URIs in Welcome Popup configuration fields stored in the wp_options or plugin-specific tables.
- Unexpected outbound HTTP requests from client browsers to external domains when loading pages that render the popup.
- Administrative account activity that does not correspond to legitimate user sessions, such as new user creation or plugin installation.
Detection Strategies
- Audit WordPress database entries associated with the welcome-popup plugin for HTML tags, JavaScript event attributes, and encoded script payloads.
- Deploy a web application firewall (WAF) rule set that inspects POST requests to plugin administrative endpoints for XSS signatures.
- Review browser console errors and Content Security Policy (CSP) violation reports for pages that host the popup.
Monitoring Recommendations
- Monitor WordPress admin and editor account logins from unusual IP addresses or geolocations.
- Alert on modifications to plugin configuration made outside of change windows or by unexpected accounts.
- Track outbound network connections from user browsers to newly registered domains referenced within popup content.
How to Mitigate CVE-2025-31605
Immediate Actions Required
- Disable or uninstall the WeblineIndia Welcome Popup plugin on all WordPress sites running version 1.0.10 or earlier until a patched release is confirmed.
- Rotate credentials for any WordPress account with administrator or editor privileges that may have accessed affected pages.
- Inspect existing popup content stored in the database and remove any entries containing script markup or suspicious HTML.
Patch Information
At the time of the NVD entry's last modification on June 17, 2026, no fixed version has been documented. Consult the Patchstack XSS Vulnerability Report for updates on vendor remediation.
Workarounds
- Restrict administrative access to the plugin using role-based access control and enforce multi-factor authentication (MFA) on privileged WordPress accounts.
- Implement a strict Content Security Policy that blocks inline scripts and restricts script sources to trusted origins.
- Deploy a WAF with XSS filtering enabled in front of the WordPress site to inspect requests targeting the plugin.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.