WestGuard WS Form LITE Plugin up to 1.10.80 on WordPress deserialization

Summaryinfo

A vulnerability described as critical has been identified in WestGuard WS Form LITE Plugin up to 1.10.80. This vulnerability affects unknown code. Such manipulation leads to deserialization. This vulnerability is traded as CVE-2026-4703. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability, which was classified as critical, has been found in WestGuard WS Form LITE Plugin up to 1.10.80. Affected by this issue is an unknown code block. The manipulation with an unknown input leads to a deserialization vulnerability. Using CWE to declare the problem leads to CWE-502. The product deserializes untrusted data without sufficiently verifying that the resulting data will be valid. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at wordfence.com. This vulnerability is handled as CVE-2026-4703 since 03/24/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 08/22/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• WordPress Plugin

Vendor

• WestGuard

Name

• WS Form LITE Plugin

Version

• 1.10.0
• 1.10.1
• 1.10.2
• 1.10.3
• 1.10.4
• 1.10.5
• 1.10.6
• 1.10.7
• 1.10.8
• 1.10.9
• 1.10.10
• 1.10.11
• 1.10.12
• 1.10.13
• 1.10.14
• 1.10.15
• 1.10.16
• 1.10.17
• 1.10.18
• 1.10.19
• 1.10.20
• 1.10.21
• 1.10.22
• 1.10.23
• 1.10.24
• 1.10.25
• 1.10.26
• 1.10.27
• 1.10.28
• 1.10.29
• 1.10.30
• 1.10.31
• 1.10.32
• 1.10.33
• 1.10.34
• 1.10.35
• 1.10.36
• 1.10.37
• 1.10.38
• 1.10.39
• 1.10.40
• 1.10.41
• 1.10.42
• 1.10.43
• 1.10.44
• 1.10.45
• 1.10.46
• 1.10.47
• 1.10.48
• 1.10.49
• 1.10.50
• 1.10.51
• 1.10.52
• 1.10.53
• 1.10.54
• 1.10.55
• 1.10.56
• 1.10.57
• 1.10.58
• 1.10.59
• 1.10.60
• 1.10.61
• 1.10.62
• 1.10.63
• 1.10.64
• 1.10.65
• 1.10.66
• 1.10.67
• 1.10.68
• 1.10.69
• 1.10.70
• 1.10.71
• 1.10.72
• 1.10.73
• 1.10.74
• 1.10.75
• 1.10.76
• 1.10.77
• 1.10.78
• 1.10.79
• 1.10.80

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Once again VulDB remains the best source for vulnerability data.

Discussion