CVE-2025-11759 Overview
CVE-2025-11759 is a Cross-Site Request Forgery (CSRF) vulnerability in the Backup, Restore and Migrate your sites with XCloner plugin for WordPress. The flaw affects all versions up to and including 4.8.2. It results from missing or incorrect nonce validation on the Xcloner_Remote_Storage:save() function [CWE-352]. Unauthenticated attackers can add or modify an FTP backup configuration by tricking a site administrator into clicking a crafted link. Successful exploitation redirects backups to an attacker-controlled FTP server, enabling exfiltration of site data.
Critical Impact
Attackers can redirect WordPress backup storage to attacker-controlled FTP servers, exfiltrating potentially sensitive site data including database contents and configuration files.
Affected Products
- XCloner Backup, Restore and Migrate WordPress plugin versions up to and including 4.8.2
- WordPress sites running the affected plugin with administrator sessions
- Any site using XCloner for remote FTP backup storage configuration
Discovery Timeline
- 2025-12-05 - CVE CVE-2025-11759 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-11759
Vulnerability Analysis
The vulnerability exists in the XCloner plugin's remote storage configuration handler. The Xcloner_Remote_Storage:save() function processes requests to save FTP backup destination settings without validating a WordPress nonce token. This design gap allows the endpoint to accept state-changing requests that lack proof of intentional administrator action.
Attackers exploit the flaw by hosting a crafted page that submits a forged POST request to the vulnerable endpoint. When an authenticated administrator visits the malicious page, the browser attaches the administrator's session cookies to the request. The plugin then saves the attacker-supplied FTP credentials as the backup destination. Subsequent scheduled or manual backups upload site archives to the attacker's FTP server.
Root Cause
The root cause is missing or incorrect nonce validation [CWE-352] on the Xcloner_Remote_Storage:save() function. WordPress provides wp_verify_nonce() and check_admin_referer() primitives to prevent CSRF, but the affected code path does not enforce these checks before persisting remote storage settings.
Attack Vector
Exploitation requires user interaction. An attacker must convince a logged-in WordPress administrator to visit a malicious page or click a crafted link. The attack succeeds without authentication on the attacker's side because the victim's browser supplies valid session credentials. The vulnerability is exploitable over the network against any site running XCloner 4.8.2 or earlier.
Refer to the Wordfence Vulnerability Report for additional technical detail.
Detection Methods for CVE-2025-11759
Indicators of Compromise
- Unexpected changes to XCloner remote storage configuration, particularly FTP host, username, or path values pointing to unfamiliar destinations
- Outbound FTP connections from the WordPress server to previously unseen external hosts
- Backup archive files appearing on remote FTP endpoints not owned by the site operator
- WordPress admin activity logs showing storage settings updates without a corresponding administrator action
Detection Strategies
- Compare current XCloner remote storage settings against a known-good baseline and alert on drift
- Monitor WordPress options table entries related to XCloner for unauthorized modifications
- Inspect web server access logs for POST requests to XCloner admin endpoints with missing or unexpected Referer headers
Monitoring Recommendations
- Enable WordPress audit logging to capture plugin setting changes with timestamps and originating user identifiers
- Track outbound FTP and FTPS traffic from web server hosts and flag connections to non-approved destinations
- Review scheduled backup job configurations weekly to confirm remote storage targets remain valid
How to Mitigate CVE-2025-11759
Immediate Actions Required
- Update the XCloner Backup, Restore and Migrate plugin to a version later than 4.8.2 as soon as the vendor releases a fixed release
- Audit current XCloner remote storage settings and reset any FTP configuration that cannot be verified as legitimate
- Rotate FTP credentials used with XCloner and revoke access for any suspicious destinations discovered during audit
Patch Information
The fix is tracked in the WordPress Plugin Change Log. Site operators should apply the corrected version through the WordPress plugin updater or by deploying the patched files from the official repository. Confirm the installed version reports higher than 4.8.2 after upgrade.
Workarounds
- Restrict WordPress administrator accounts to dedicated browsers or sessions to reduce exposure to CSRF payloads on unrelated sites
- Deploy a Web Application Firewall rule that blocks POST requests to XCloner storage endpoints lacking a valid WordPress nonce parameter
- Temporarily deactivate the XCloner plugin on sites that do not require immediate backup functionality until the patched version is installed
# Verify installed XCloner version via WP-CLI
wp plugin get xcloner-backup-and-restore --field=version
# Update to the latest available release
wp plugin update xcloner-backup-and-restore
# Deactivate temporarily if patching is not yet possible
wp plugin deactivate xcloner-backup-and-restore
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
