CVE-2026-57723: VikBooking Hotel Booking Engine CSRF Flaw

CVE-2026-57723 Overview

CVE-2026-57723 is a Cross-Site Request Forgery (CSRF) vulnerability chained with Path Traversal in the e4jvikwp VikBooking Hotel Booking Engine & PMS plugin for WordPress. The flaw affects all versions from unknown up through 1.8.12. An attacker can craft a malicious request that, when triggered by an authenticated administrator visiting an attacker-controlled page, causes arbitrary file deletion on the underlying server. The vulnerability maps to CWE-352: Cross-Site Request Forgery. Successful exploitation impacts site availability by allowing removal of files outside intended directories.

Critical Impact
CSRF combined with path traversal enables arbitrary file deletion on affected WordPress installations, potentially disrupting site functionality when critical files such as wp-config.php are removed.

Affected Products

e4jvikwp VikBooking Hotel Booking Engine & PMS plugin for WordPress
All versions from n/a through 1.8.12
WordPress sites with the vulnerable plugin installed and an authenticated administrator session

Discovery Timeline

2026-07-01 - CVE-2026-57723 published to NVD
2026-07-01 - Last updated in NVD database

Technical Details for CVE-2026-57723

Vulnerability Analysis

The vulnerability stems from missing anti-CSRF token validation on a plugin request handler that accepts a file path parameter. An attacker hosts a malicious page containing a forged request targeting the vulnerable endpoint. When an authenticated administrator visits the page, the browser transmits session cookies alongside the attacker-crafted parameters. The plugin processes the request without verifying request origin or nonce authenticity.

Because the underlying handler also fails to sanitize path input, the attacker can traverse directories using sequences such as ../ to reference files outside the plugin scope. The chain results in arbitrary file deletion executed under the administrator's session context. The user interaction requirement is limited to visiting a page, which lowers the practical exploitation barrier.

Root Cause

The root cause is the absence of proper CSRF protections (WordPress nonces or equivalent origin validation) on a state-changing action, combined with insufficient input validation on a file path parameter. See the Patchstack CSRF Vulnerability Report for advisory details.

Attack Vector

Exploitation requires network access and user interaction from a privileged WordPress user. The attacker delivers a phishing link, embedded image, or auto-submitting form referencing the vulnerable endpoint. Once triggered, the request executes with administrator privileges and deletes attacker-chosen files on the server. Refer to the vendor advisory for endpoint specifics rather than fabricated request examples.

Detection Methods for CVE-2026-57723

Indicators of Compromise

Unexpected deletion of WordPress core files, plugin files, or configuration files such as wp-config.php
HTTP POST or GET requests to VikBooking plugin endpoints originating from external Referer headers
Administrator session activity coinciding with anomalous file system changes on the web server
Error entries in the WordPress debug log indicating missing files following administrator navigation events

Detection Strategies

Monitor web server access logs for requests to VikBooking plugin URLs with suspicious path parameters containing ../ sequences
Correlate WordPress administrator logins with subsequent file deletion events on the underlying filesystem
Deploy file integrity monitoring across the WordPress installation directory to alert on unauthorized file removal
Inspect HTTP Referer headers on state-changing plugin requests for external domains

Monitoring Recommendations

Enable WordPress audit logging plugins to capture administrator actions and plugin-triggered file operations
Forward web server logs to a centralized SIEM for correlation with endpoint file activity
Alert on any modifications to sensitive files including wp-config.php, .htaccess, and plugin loader files
Track outbound browsing activity from administrator workstations to identify phishing lure delivery

How to Mitigate CVE-2026-57723

Immediate Actions Required

Update the VikBooking Hotel Booking Engine & PMS plugin to a version released after 1.8.12 that addresses the CSRF flaw
Restrict WordPress administrator access to dedicated browsers or workstations not used for general web browsing
Enforce multi-factor authentication on all WordPress administrator accounts to limit account takeover risk
Take a full backup of the WordPress installation and database before applying updates

Patch Information

Consult the Patchstack advisory for the fixed version and vendor patch release. Apply the update through the WordPress plugin management interface or by replacing plugin files directly on the server.

Workarounds

Deactivate and remove the VikBooking plugin until a patched version can be installed
Deploy a Web Application Firewall (WAF) rule blocking requests to VikBooking endpoints that contain path traversal sequences
Restrict administrator panel access by IP allowlisting through the web server or reverse proxy configuration
Configure the web server to enforce strict SameSite=Strict cookies for WordPress authentication sessions where feasible

bash

# Example WAF rule concept - block path traversal in query parameters
# Adapt syntax to your WAF platform (ModSecurity, Cloudflare, AWS WAF)
SecRule ARGS "@rx \.\./" \
    "id:1057723,phase:2,deny,status:403,\
    msg:'Path traversal attempt targeting VikBooking plugin (CVE-2026-57723)'"