CVE-2024-11462 Overview
CVE-2024-11462 is a Reflected Cross-Site Scripting (XSS) vulnerability in the Filestack Official plugin for WordPress. The flaw affects all versions up to and including 2.1.0. Attackers can inject arbitrary web scripts through the fstab and filestack_options parameters because the plugin fails to properly sanitize input and escape output. Unauthenticated attackers can weaponize the flaw by tricking a user into clicking a crafted link. The vulnerability is tracked under CWE-79.
Critical Impact
Unauthenticated attackers can execute arbitrary JavaScript in a victim's browser session, enabling credential theft, session hijacking, or unauthorized administrative actions when a WordPress administrator interacts with a malicious link.
Affected Products
- Filestack Official plugin for WordPress, versions up to and including 2.1.0
- WordPress installations with the Filestack upload plugin enabled
- Any site exposing the vulnerable fstab or filestack_options request parameters
Discovery Timeline
- 2024-12-14 - CVE-2024-11462 published to the National Vulnerability Database (NVD)
- 2026-06-17 - Last updated in the NVD database
Technical Details for CVE-2024-11462
Vulnerability Analysis
The vulnerability resides in the plugin's admin settings handler at lib/admin-settings.php. The code reflects the fstab and filestack_options request parameters into rendered HTML without applying WordPress sanitization or escaping functions. This produces a classic reflected XSS sink where attacker-controlled input executes as script content in the browser context of the requesting user.
Because the payload is reflected rather than stored, exploitation requires user interaction. An attacker crafts a URL containing malicious JavaScript in the vulnerable parameters and delivers it through phishing, social engineering, or a malicious referrer. When an authenticated WordPress administrator opens the link, the payload runs with that user's session privileges.
Root Cause
The root cause is insufficient input sanitization and output escaping [CWE-79]. WordPress provides functions such as sanitize_text_field(), esc_attr(), and esc_html() for exactly this scenario. The vulnerable plugin code omits these controls on the fstab and filestack_options parameters before echoing them back into HTML attributes or page content.
Attack Vector
Exploitation occurs over the network and requires user interaction, but no authentication or elevated privileges on the attacker's side. A successful attack can pivot from a single click into full administrative compromise of the WordPress site. Impact includes account takeover, malicious plugin installation, defacement, and injection of persistent web shells through admin-only functionality. See the Wordfence Vulnerability Analysis for additional context.
No verified proof-of-concept code is published for this CVE. Refer to the WordPress Plugin Admin Settings source for the vulnerable code location.
Detection Methods for CVE-2024-11462
Indicators of Compromise
- HTTP request logs containing fstab or filestack_options query parameters with URL-encoded <script>, javascript:, or event-handler payloads such as onerror= and onload=.
- Referrer headers pointing to unfamiliar external domains delivering links to /wp-admin/ pages that reference the Filestack plugin.
- Unexpected administrative actions, plugin installations, or user account creations following an administrator visit to a crafted URL.
Detection Strategies
- Inspect web server and WordPress access logs for encoded script payloads in query strings targeting Filestack plugin endpoints.
- Deploy a Web Application Firewall (WAF) rule to flag reflected XSS signatures against the fstab and filestack_options parameter names.
- Correlate outbound browser telemetry from admin workstations with anomalous JavaScript execution originating from wp-admin pages.
Monitoring Recommendations
- Enable verbose WordPress audit logging for plugin settings changes and administrator session activity.
- Alert on new administrator accounts, plugin uploads, and theme edits performed shortly after an admin follows an external link.
- Track browser-side Content Security Policy (CSP) violation reports to identify script injection attempts against admin pages.
How to Mitigate CVE-2024-11462
Immediate Actions Required
- Update the Filestack Official plugin to a version later than 2.1.0 as soon as a fixed release is available from the vendor.
- If no patched version is available, deactivate and remove the plugin from the WordPress installation.
- Force-reset administrator sessions and rotate credentials for any accounts that may have followed suspicious links.
Patch Information
Review the WordPress Plugin Changeset for remediation details and apply the vendor-supplied fix. Verify the installed version against the WordPress plugin repository after updating. Confirm that the patched code applies esc_attr() and equivalent escaping around the fstab and filestack_options output.
Workarounds
- Deploy WAF rules that block requests containing script tags, event handlers, or javascript: schemes in the fstab and filestack_options parameters.
- Restrict access to /wp-admin/ by IP allow-list or VPN to reduce the exposure window for reflected XSS delivery.
- Enforce a strict Content Security Policy on WordPress admin pages to block inline script execution.
# Example WAF rule pattern (ModSecurity) - adapt to your environment
SecRule ARGS:fstab|ARGS:filestack_options "@rx (?i)(<script|javascript:|onerror=|onload=)" \
"id:1011462,phase:2,deny,status:403,msg:'Reflected XSS attempt against Filestack plugin (CVE-2024-11462)'"
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
