What is CVE-2026-14556?

CVE-2026-14556 is a medium-severity vulnerability in Happyforms, classified under Improper Encoding or Escaping of Output. CVSS score: 5.4/10. Published 2026-10-21.

How severe is CVE-2026-14556?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Vulnerability in Happyforms

CVE-2026-14556

The HappyForms WordPress plugin before 1.26.15 does not sanitise or escape a user-controlled referral value before embedding it in the form notification email, allowing unauthenticated attackers to inject arbitrary HTML into the emails site administrators receive.

Published 2026-10-21 · last modified 2026-10-21.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/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

Weakness classification (CWE)

CWE-116 — Improper Encoding or Escaping of Output

References

wpscan.com/vulnerability/7673862c-b37c-4c7e-af3f-c32cbd2deb23/ (technical-description, exploit, vdb-entry)

Frequently asked questions

What is CVE-2026-14556?: CVE-2026-14556 is a medium-severity vulnerability in Happyforms, classified under Improper Encoding or Escaping of Output. CVSS score: 5.4/10. Published 2026-10-21.
How severe is CVE-2026-14556?: Medium severity. CVSS v3 base score is 5.4 out of 10.