CVE-2026-14500 in Bulk Order Update for WooCommerce Plugin
Summary
by MITRE • 07/08/2026
The Bulk Order Update for WooCommerce plugin for WordPress is vulnerable to Arbitrary File Read in versions up to, and including, 1.6. This is due to the bouw_fetch_csv_data() AJAX handler being registered on the wp_ajax_nopriv_ hook with no capability or nonce check, and passing the attacker-supplied csv_url POST parameter — filtered only by esc_url_raw() (which leaves absolute filesystem paths intact) and validate_file() (which only rejects '..' traversal patterns) — directly into fopen()/fgetcsv() and reflecting the first parsed line in the JSON response. This makes it possible for unauthenticated attackers to read the first line of arbitrary files on the server (such as /etc/passwd) and to use the handler as a file-existence oracle.
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Analysis
by VulDB Data Team • 07/08/2026
The Bulk Order Update for WooCommerce plugin presents a critical security vulnerability that allows unauthenticated attackers to perform arbitrary file reads on affected WordPress installations. This flaw exists in versions up to and including 160 where the bouw_fetch_csv_data() AJAX handler is improperly exposed through the wp_ajax_nopriv_ hook without any authentication or authorization checks. The vulnerability stems from insufficient input validation and sanitization mechanisms that process attacker-controlled data directly into server-side file operations.
The technical implementation of this vulnerability exploits the lack of proper capability checks and nonce verification within the AJAX endpoint registration. When an attacker sends a POST request to the vulnerable handler with a csv_url parameter, the plugin processes this input through esc_url_raw() function which only sanitizes URL schemes and does not strip absolute filesystem paths that may be present in the input. Additionally, validate_file() function is employed but only rejects specific traversal patterns like '..' while leaving other potentially malicious path constructs intact. These insufficient validation measures allow attackers to construct file paths that bypass security restrictions.
The operational impact of this vulnerability extends beyond simple information disclosure as it enables attackers to read the first line of any file accessible by the web server process, including sensitive system files such as /etc/passwd. This capability provides attackers with a file-existence oracle that can be used to probe the target system for specific files and directories. The reflected response containing the first parsed line of the requested file allows for information gathering without requiring authentication, making this attack vector particularly dangerous in automated exploitation scenarios.
This vulnerability aligns with CWE-22 (Improper Limitation of a Pathname to a Restricted Directory) and CWE-73 (External Control of File Name or Path) while mapping to ATT&CK technique T1213.002 (Data from Information Repositories) and T1566.001 (Phishing with Social Engineering). The lack of proper input validation combined with insufficient privilege checks creates a pathway for attackers to escalate their access level and potentially extract sensitive data from the server environment.
Mitigation strategies should include immediate patching of affected versions, implementing proper capability checks on the AJAX endpoint registration, and applying stricter input validation that explicitly rejects absolute filesystem paths. Administrators should also consider restricting access to the wp_ajax_nopriv_ hook through additional firewall rules or authentication layers. The plugin developers should implement comprehensive sanitization functions that validate file paths against a whitelist of allowed directories and reject any input containing potentially dangerous path traversal sequences. Regular security audits of AJAX endpoint implementations and proper principle of least privilege enforcement should be implemented to prevent similar vulnerabilities in future releases.