CVE-2026-16143: VikRentItems Flexible Rental Management System <= 1.2.1 - Unauthenticated Stored Cross-Site Scripting
The VikRentItems – Flexible Rental Management System plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the customer email field of the booking checkout form in versions up to, and including, 1.2.1. This is due to insufficient input sanitization and output escaping in the saveorder() function, which stores the raw email value via VikRequest::getString() (applying only sanitizetextfield(), which does not neutralize HTML attribute-breaking characters such as double quotes), and in the editorder template which echoes the stored custmail value into an HTML input element's value attribute without escattr(). This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
WordPress plugin: VikRentItems – Flexible Rental Management Systemto a version that resolves this vulnerability.Fixed in 1.2.1 - Configuration
Update the plugin code so saveorder() properly sanitizes the customer email beyond sanitize_text_field() for HTML attribute-breaking characters, and modify the editorder template to escape custmail with esc_attr() before outputting it into an HTML input element's value attribute.
WordPress plugin: VikRentItems – Flexible Rental Management System customer email field handling (saveorder() and editorder template) = Apply output escaping for custmail when rendering into HTML attribute and ensure stored value is properly sanitized to neutralize HTML attribute-breaking characters (e.g., double quotes) - Compensating control
Limit exposure of booking checkout/order pages to reduce risk until the plugin is patched (e.g., restrict access via WAF/rate limiting and monitor for unusual requests to checkout/order pages).
Event History
Frequently Asked Questions
What is the severity of CVE-2026-16143?
CVE-2026-16143 has a severity rating of high with a score of 7.2.
How do I fix CVE-2026-16143?
To fix CVE-2026-16143, update the VikRentItems Flexible Rental Management System plugin to version 1.2.2 or later.
What kind of vulnerability is CVE-2026-16143?
CVE-2026-16143 is an Unauthenticated Stored Cross-Site Scripting (XSS) vulnerability.
Which versions of VikRentItems are affected by CVE-2026-16143?
Versions of VikRentItems Flexible Rental Management System up to and including 1.2.1 are affected by CVE-2026-16143.
What is the cause of CVE-2026-16143?
CVE-2026-16143 is caused by insufficient input sanitization and output escaping in the customer email field of the booking checkout form.