What is CVE-2026-93755?

CVE-2026-93755 is a high-severity vulnerability in Happyforms Pro, classified under Cross-site Scripting. CVSS score: 7.2/10. Published 2026-11-07.

How severe is CVE-2026-93755?

High severity. CVSS v3 base score is 7.2 out of 10.

XSS in Happyforms Pro

CVE-2026-93755

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.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2026-11-07 · last modified 2026-11-07.

CVSS v3 metric

CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Happyforms Pro

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

Frequently asked questions

What is CVE-2026-93755?: CVE-2026-93755 is a high-severity vulnerability in Happyforms Pro, classified under Cross-site Scripting. CVSS score: 7.2/10. Published 2026-11-07.
How severe is CVE-2026-93755?: High severity. CVSS v3 base score is 7.2 out of 10.