Happyforms Plugin up to 1.38.9 on WordPress Client IP happyforms_get_client_ip cross site scripting

Summaryinfo

A vulnerability classified as problematic was found in Happyforms Plugin up to 1.38.9. Affected by this vulnerability is the function happyforms_get_client_ip of the component Client IP Handler. Executing a manipulation can lead to cross site scripting. This vulnerability is handled as CVE-2026-93755. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability classified as problematic was found in Happyforms Plugin up to 1.38.9. This vulnerability affects the function happyforms_get_client_ip of the component Client IP Handler. The manipulation with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. CVE summarizes:

The Happyforms plugin for WordPress is vulnerable to Stored Cross-Site Scripting via spoofable client IP headers in versions up to, and including, 1.38.9. This is due to the happyforms_get_client_ip() function reading raw HTTP_CLIENT_IP and HTTP_X_FORWARDED_FOR request headers without any validation or sanitization, storing the value as post meta ('client_ip') via update_post_meta() during unauthenticated form submissions, and later echoing it in the admin submission edit screen's Details metabox without output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user (typically an administrator reviewing a submission) accesses an injected page.

The advisory is available at wordfence.com. This vulnerability was named CVE-2026-93755 since 09/18/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1059.007 by the MITRE ATT&CK project.

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

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

• WordPress Plugin

Name

• Happyforms Plugin

Version

• 1.38.0
• 1.38.1
• 1.38.2
• 1.38.3
• 1.38.4
• 1.38.5
• 1.38.6
• 1.38.7
• 1.38.8
• 1.38.9

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

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• 🔒
• 🔒

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Entryinfo

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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