CVE-2026-4703: WS Form LITE <= 1.10.80 - Unauthenticated PHP Object Injection via Form Submission
The WS Form LITE – Drag & Drop Contact Form Builder plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 1.10.80 via deserialization of untrusted input from form submission meta values. This makes it possible for unauthenticated attackers to inject a PHP Object. No known POP chain is present in the vulnerable software, which means this vulnerability has no impact unless another plugin or theme containing a POP chain is installed on the site. If a POP chain is present via an additional plugin or theme installed on the target system, it may allow the attacker to perform actions like delete arbitrary files, retrieve sensitive data, or execute code depending on the POP chain present.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
wordpress/WS Form LITE – Drag & Drop Contact Form Builderto a version that resolves this vulnerability.Fixed in 1.10.80 - Compensating control
If any additional WordPress plugin or theme is installed that contains a POP chain, remove/replace it, because a POP chain may enable actions such as deleting arbitrary files, retrieving sensitive data, or executing code.
Event History
Frequently Asked Questions
Which sites are practically at risk of serious impact?
Sites running WS Form LITE version 1.10.80 or earlier are vulnerable to object injection. Meaningful impact additionally requires another installed plugin or theme to provide a usable PHP POP chain; no known POP chain exists in WS Form LITE itself.
Does exploitation require an account or user interaction?
No. An unauthenticated attacker can submit crafted form metadata, so exploitation does not require WordPress credentials or victim interaction.
What could happen if a compatible POP chain exists elsewhere on the site?
Depending on the available POP chain, an attacker may be able to delete arbitrary files, retrieve sensitive data, or execute code.