CVE-2025-23661: NV Slider CSRF Vulnerability

CVE-2025-23661 Overview

CVE-2025-23661 is a Cross-Site Request Forgery (CSRF) vulnerability in the ryscript NV Slider WordPress plugin that leads to Stored Cross-Site Scripting (XSS). The flaw affects NV Slider versions up to and including 1.6. An attacker can craft a malicious request that, when executed by an authenticated administrator, injects persistent JavaScript into the plugin's stored configuration. The injected payload then executes in the browser context of any user who loads the affected page. The vulnerability is tracked under CWE-352 and was published to the National Vulnerability Database on January 16, 2025.

Critical Impact

Successful exploitation enables persistent script execution in administrator sessions, leading to session theft, account takeover, and further compromise of the WordPress site.

Affected Products

• ryscript NV Slider WordPress plugin versions through 1.6
• WordPress installations with the vulnerable nv-slider plugin enabled
• Administrator accounts that authenticate while a CSRF payload is delivered

Discovery Timeline

• 2025-01-16 - CVE-2025-23661 published to the National Vulnerability Database
• 2026-04-23 - Last updated in the NVD database

Technical Details for CVE-2025-23661

Vulnerability Analysis

The NV Slider plugin exposes state-changing actions without sufficient anti-CSRF protection. The plugin fails to validate a nonce or other unpredictable token on requests that update slider configuration data. As a result, an attacker can forge a request that an authenticated administrator's browser submits silently. The forged request stores attacker-controlled markup in plugin settings, where it is later rendered without proper output encoding. This chain converts a CSRF primitive into a Stored XSS condition, expanding the impact beyond a single request.

Root Cause

The root cause is missing CSRF token verification on plugin administrative endpoints, combined with inadequate input sanitization and output escaping for stored configuration values. WordPress provides wp_nonce_field() and check_admin_referer() helpers, but the plugin does not apply them consistently. The stored data is rendered into HTML contexts without escaping helpers such as esc_html() or esc_attr(), allowing injected scripts to execute when the page renders.

Attack Vector

Exploitation requires user interaction. An attacker hosts a malicious page or sends a crafted link to a WordPress administrator. When the administrator visits the page while logged in, the browser submits a forged POST request to the vulnerable plugin endpoint. The request writes attacker-supplied JavaScript into the slider configuration. Subsequent visits to pages that render the slider trigger execution of the stored payload in the victim's browser, enabling cookie theft, administrative action hijacking, and pivoting to additional WordPress functionality.

// No verified public exploit code is available for CVE-2025-23661.
// See the Patchstack advisory referenced below for technical details.

Detection Methods for CVE-2025-23661

Indicators of Compromise

• Unexpected <script> tags, event handlers, or javascript: URIs in NV Slider configuration records stored in the wp_options table
• WordPress administrator sessions performing slider updates from referrers outside the site's own admin domain
• Outbound requests from admin browsers to unfamiliar domains shortly after viewing pages rendering NV Slider content

Detection Strategies

• Review the NV Slider plugin settings stored in the database for HTML or JavaScript content that should not be present in configuration fields
• Inspect web server access logs for POST requests to NV Slider admin endpoints lacking a valid WordPress nonce parameter
• Correlate administrator authentication events with subsequent slider configuration changes that originate from external referrers

Monitoring Recommendations

• Enable WordPress audit logging to record plugin option changes and administrator actions
• Monitor for cross-origin POST requests targeting wp-admin endpoints associated with the nv-slider plugin
• Alert on the appearance of script payloads, iframe tags, or encoded JavaScript in plugin-managed database fields

How to Mitigate CVE-2025-23661

Immediate Actions Required

• Deactivate and remove the NV Slider plugin if a patched version is not available, since the plugin is affected through version 1.6 with no fixed release indicated in the advisory
• Rotate WordPress administrator passwords and invalidate active sessions if exploitation is suspected
• Audit slider configuration records and restore clean values from backups taken before suspected compromise

Patch Information

At the time of publication, the Patchstack Vulnerability Report lists the plugin as affected from n/a through <= 1.6 without a confirmed fixed version. Administrators should monitor the plugin's WordPress.org listing for an updated release and apply it as soon as one becomes available.

Workarounds

• Restrict access to the WordPress administrative interface using IP allow-listing or VPN-gated access to reduce CSRF exposure
• Deploy a Web Application Firewall (WAF) rule that blocks POST requests to NV Slider endpoints missing a valid WordPress nonce
• Enforce browser session isolation for administrators by using dedicated browsers or profiles when managing WordPress
• Require administrators to log out of WordPress sessions when not actively performing administrative tasks

# Example: disable the NV Slider plugin via WP-CLI
wp plugin deactivate nv-slider
wp plugin delete nv-slider