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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 WS Form LITE是WordPress基金会开源的一款提供表单构建功能的CMS插件。 WordPress WS Form LITE 1.10.80及之前版本存在反序列化注入漏洞，该漏洞源于对表单提交元值中不可信输入的反序列化，可能导致未经身份验证的攻击者注入PHP对象；若存在POP链，可能允许攻击者删除任意文件、检索敏感数据或执行代码。

CVSS 9.8 · Critical EPSS 0.90% · P59

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
Vulnerability Title
WordPress WS Form LITE 反序列化注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress WS Form LITE是WordPress基金会开源的一款提供表单构建功能的CMS插件。 WordPress WS Form LITE 1.10.80及之前版本存在反序列化注入漏洞，该漏洞源于对表单提交元值中不可信输入的反序列化，可能导致未经身份验证的攻击者注入PHP对象；若存在POP链，可能允许攻击者删除任意文件、检索敏感数据或执行代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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

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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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