CVE-2024-49221 Overview
CVE-2024-49221 is a Cross-Site Request Forgery (CSRF) vulnerability in the cSlider WordPress plugin developed by julian.weinert. The flaw affects all plugin versions up to and including 2.4.2. According to the Patchstack advisory, the CSRF weakness chains into stored Cross-Site Scripting (XSS), allowing attackers to persist malicious script content through forged administrative requests. Exploitation requires an authenticated administrator to visit an attacker-controlled page while logged in to WordPress. The vulnerability is tracked under CWE-352: Cross-Site Request Forgery.
Critical Impact
A successful attack can inject stored JavaScript into WordPress pages that use cSlider, leading to session compromise, administrative account takeover, or site defacement affecting all visitors.
Affected Products
- cSlider WordPress plugin versions up to and including 2.4.2
- WordPress installations running the vulnerable julianweinert/cslider plugin
- Sites where administrators can be socially engineered into visiting attacker-controlled URLs
Discovery Timeline
- 2024-10-17 - CVE-2024-49221 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2024-49221
Vulnerability Analysis
The cSlider plugin exposes administrative actions that modify slider content without validating the origin of the request. The plugin does not enforce WordPress nonce checks (wp_verify_nonce) or equivalent anti-CSRF tokens on state-changing endpoints. An attacker who crafts a malicious HTML form or image tag can trigger these actions when an authenticated administrator loads the attacker's page.
Because the affected endpoints accept user-controlled slider content without sufficient output encoding, the CSRF primitive escalates into stored XSS. The injected payload persists in the WordPress database and executes in the browser of any user rendering the compromised slider. The attack requires user interaction, but the actor providing that interaction is the victim administrator.
Root Cause
The root cause is missing CSRF protection on privileged plugin actions combined with insufficient sanitization of stored slider data. WordPress plugins are expected to pair capability checks with nonce validation on any request that mutates persistent state. The cSlider plugin fails this control, leaving admin actions reachable through forged cross-origin requests.
Attack Vector
Exploitation follows a standard CSRF-to-stored-XSS chain. The attacker hosts a page containing an auto-submitting form targeting a vulnerable cSlider endpoint. When an authenticated WordPress administrator visits the page, the browser attaches valid session cookies and the request executes with administrator privileges. The forged request writes attacker-controlled markup into a slider field, and the payload executes when any user loads the slider on the front end or in the admin dashboard.
Technical exploitation details are available in the Patchstack Vulnerability Report.
Detection Methods for CVE-2024-49221
Indicators of Compromise
- Unexpected <script>, onerror, or onload attributes inside cSlider database entries stored in wp_options or plugin-specific tables
- WordPress admin sessions initiating POST requests to cSlider endpoints with Referer headers pointing to external domains
- New or modified slider entries created outside of documented administrator activity windows
- Outbound requests from visitor browsers to unknown domains after loading pages containing cSlider content
Detection Strategies
- Audit the WordPress database for slider records containing HTML event handlers or <script> tags injected into text fields
- Inspect web server access logs for cross-origin POST requests to wp-admin/admin.php targeting cSlider actions without a matching _wpnonce parameter
- Monitor for administrator accounts triggering plugin configuration changes shortly after browsing external sites
Monitoring Recommendations
- Enable request logging for all wp-admin endpoints and correlate Referer values with expected internal origins
- Deploy a Web Application Firewall (WAF) rule set that flags missing or invalid WordPress nonces on plugin action requests
- Alert on file integrity changes to WordPress plugin directories and unexpected modifications to slider content stored in the database
How to Mitigate CVE-2024-49221
Immediate Actions Required
- Update the cSlider plugin to a version later than 2.4.2 once the vendor publishes a patched release
- If no patched version is available, deactivate and remove the plugin from all WordPress sites
- Review existing slider entries for injected script content and remove any unauthorized markup
- Rotate WordPress administrator credentials and invalidate active sessions if compromise is suspected
Patch Information
The Patchstack advisory identifies all versions up to and including 2.4.2 as vulnerable. Administrators should consult the Patchstack Vulnerability Report for the current patch status and upgrade guidance from the plugin author.
Workarounds
- Restrict administrative access to WordPress using IP allowlisting or VPN-only access to wp-admin
- Require administrators to use dedicated browsers or isolated browser profiles for WordPress management
- Deploy a WAF rule that blocks cross-origin POST requests to WordPress admin endpoints lacking a valid _wpnonce parameter
- Enforce a Content Security Policy (CSP) that restricts inline script execution on WordPress front-end pages
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
