CVE-2026-14556

HappyForms < 1.26.15 - Unauthenticated HTML Injection in Admin Notification Email via client_referer

Published Oct 21, 2026 CVSS 3.1 · 5.4 Medium EPSS < 1% KEV · Not listed
Description
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Weaknesses CWE-116
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description 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.
Title HappyForms < 1.26.15 - Unauthenticated HTML Injection in Admin Notification Email via client_referer
References
Metrics cvssV3_1

{'score': 5.4, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N'}

Subscriptions

No data.

Weaknesses

Sources

Status
PUBLISHED
Assigner
WPScan
Published
Updated
Oct 21, 2026, 10:14 AM
Reserved
Jul 3, 2026, 9:15 AM
Status
Deferred
Published
Oct 21, 2026, 9:17 AM
Modified
Oct 21, 2026, 6:37 PM