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CVE-2026-4703— WS Form LITE <= 1.10.80 - Unauthenticated PHP Object Injection via Form Submission

Quick assessment

Affected
westguard WS Form LITE – Drag & Drop Contact Form Builder
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WordPress 插件 WS Form LITE – Drag & Drop Contact Form Builder 存在 PHP 对象注入漏洞，影响版本范围为所有不超过 1.10.80 的版本。该漏洞源于对用户提交的表单元值中未经校验的数据进行了反序列化操作，导致未认证的远程攻击者可注入恶意 PHP 对象。 然而，该易受攻击的软件本身不包含已知的 POP（Property Oriented Programming，面向属性编程）链，因此单独利用此漏洞不会产生实际影响，除非目标网站上还安装了其他包含 POP 链

CVSS 9.8 · Critical EPSS 0.90% · P57

Affected Version Matrix 1

VendorProduct Version RangeStatus
westguard WS Form LITE – Drag & Drop Contact Form Builder ≤ 1.10.80 affected
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I. Basic Information for CVE-2026-4703

Vulnerability Information
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Vulnerability Title
WS Form LITE <= 1.10.80 - Unauthenticated PHP Object Injection via Form Submission
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
可信数据的反序列化
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
westguard WS Form LITE – Drag & Drop Contact Form Builder 0 ~ 1.10.80 -

II. Public POCs for CVE-2026-4703

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-4703

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Vendor Advisories for CVE-2026-4703 (1)

Other References for CVE-2026-4703 (1)

IV. Related Vulnerabilities

Same product: WS Form LITE – Drag & Drop Contact Form Builder
Same vendor: westguard
Same weakness: CWE-502

V. Comments for CVE-2026-4703

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