CVE-2026-93755 Details
Description
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.
A stored cross-site scripting vulnerability has been identified in the Happyforms plugin for WordPress, affecting versions through 1.38.9. The issue arises because the function happyforms_get_client_ip() improperly processes raw HTTP_CLIENT_IP and HTTP_X_FORWARDED_FOR headers without validation or sanitization. During unauthenticated form submissions, these headers are saved as post meta ('client_ip') using update_post_meta(). The injected scripts are executed when an administrator accesses the submission details in the admin panel.
Users can update to Happyforms version 1.38.10 or a newer patched version to address this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Nov 7, 2026CISA-ADP
Assessed Nov 7, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://happyforms.io/whats-new/ | [email protected] | Release NotesVendor |
| https://www.wordfence.com/threat-intel/vulnerabilities/id/17e95c94-0a63-494e-b4b0-823b9cd0f7d3?source=cve | [email protected] | AdvisoryRemedy |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-79 | Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Happyforms | <= 1.38.9 (semver) |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Nov 7, 2026 | CVE Modified | CISA-ADP |
| Nov 7, 2026 | New CVE Received | [email protected] |