CVE-2025-12092: CYAN Backup WordPress Path Traversal Flaw

CVE-2025-12092 Overview

The CYAN Backup plugin for WordPress contains an arbitrary file deletion vulnerability affecting all versions up to and including 2.5.4. The flaw resides in the delete functionality, where insufficient file path validation allows authenticated attackers with Administrator-level access to delete arbitrary files on the server. Deleting sensitive files such as wp-config.php can trigger the WordPress setup routine and enable remote code execution. The vulnerability is tracked under [CWE-22] (Improper Limitation of a Pathname to a Restricted Directory).

Critical Impact
Authenticated administrators can delete arbitrary server files, leading to potential remote code execution through targeted removal of wp-config.php.

Affected Products

CYAN Backup plugin for WordPress, all versions through 2.5.4
WordPress sites using the affected plugin with untrusted administrator accounts
Patched in CYAN Backup version 2.5.5

Discovery Timeline

2025-11-08 - CVE-2025-12092 published to the National Vulnerability Database (NVD)
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-12092

Vulnerability Analysis

The CYAN Backup plugin exposes a backup management page that lets administrators remove existing backup archives. The delete handler in includes/page-backups.php accepts a filename from the request and passes it to the deletion routine without confirming that the target file is actually a backup managed by the plugin. An attacker who reaches this handler can supply an arbitrary path and delete any file the web server user can access.

On WordPress installations, removing wp-config.php triggers the setup wizard on the next request. An attacker can then connect the site to an attacker-controlled database and stage administrative content that yields code execution. Other high-impact targets include .htaccess, plugin bootstrap files, and security tooling on disk.

Root Cause

The root cause is missing allowlist validation on the file path submitted to the delete action. The handler does not verify that the requested file exists within the plugin's backup directory or matches the expected backup filename pattern. Because the check is absent, path traversal is not even required — a fully qualified path passed to the deletion call is honored.

Attack Vector

Exploitation requires an authenticated session with Administrator-level privileges and a valid backup nonce. The request is delivered over the network to the WordPress admin interface, and the operation completes without user interaction. Because the vulnerability sits behind the admin capability check, common abuse scenarios include compromised administrator accounts, malicious co-administrators on multi-tenant sites, and privilege chaining from other plugin flaws.

php

// Patch excerpt from includes/page-backups.php
// Source: https://github.com/toolstack/cyan-backup/commit/4a79d23e8ba330b5cb655a083c6a00ef32a7b249

	if( !is_admin() )
		wp_die(__('Access denied!', $this->textdomain));

	$this->verify_status_file();
	$backup_files = $this->backup_files_info($this->get_backup_files());

	$notes = array();
	$nonce_field = 'backup';

The patch introduces $backup_files = $this->backup_files_info($this->get_backup_files()); so the delete routine can constrain operations to files that the plugin actually manages, instead of trusting the raw request input.

Detection Methods for CVE-2025-12092

Indicators of Compromise

Unexpected POST requests to the CYAN Backup admin page (admin.php?page=cyan-backup...) containing delete actions with unusual filename parameters.
Missing or newly recreated wp-config.php, .htaccess, or plugin loader files on hosts running CYAN Backup ≤ 2.5.4.
WordPress installation wizard (/wp-admin/setup-config.php) served to end users on a previously configured site.
New administrator accounts or unfamiliar database connection strings introduced immediately after suspicious plugin activity.

Detection Strategies

Compare current WordPress core, plugin, and theme file inventories against known-good baselines to detect unauthorized deletions.
Alert on web access logs where authenticated admin sessions invoke the CYAN Backup delete action with filenames outside the plugin's backup directory.
Correlate administrator authentication events with file deletion telemetry on the underlying host to identify abuse of legitimate credentials.

Monitoring Recommendations

Enable file integrity monitoring on wp-config.php, .htaccess, and the wp-content/plugins/ tree.
Forward WordPress audit logs and web server access logs to a centralized platform for correlation and long-term retention.
Track administrator session activity, especially plugin management actions performed outside normal maintenance windows.

How to Mitigate CVE-2025-12092

Immediate Actions Required

Upgrade CYAN Backup to version 2.5.5 or later on every WordPress site where the plugin is installed.
Audit administrator accounts, remove unused ones, and rotate credentials for any account that may have been compromised.
Restore any deleted core or configuration files from trusted backups and verify site integrity before returning to production.

Patch Information

The fix is available in CYAN Backup 2.5.5. Reference the GitHub commit 4a79d23, the WordPress plugin changeset 3390065, and the Wordfence vulnerability report for details on the change.

Workarounds

Deactivate and remove CYAN Backup until the update to 2.5.5 can be applied.
Restrict Administrator role assignment to a minimal set of trusted operators and require multi-factor authentication for all admin logins.
Apply file system permissions that prevent the web server user from deleting wp-config.php and other critical files where operationally feasible.

bash

# Verify the installed CYAN Backup version via WP-CLI and update to the patched release
wp plugin get cyan-backup --field=version
wp plugin update cyan-backup --version=2.5.5