Medium severity · published Oct 21, 2026
CVE-2026-14556
HappyForms < 1.26.15 - Unauthenticated HTML Injection in Admin Notification Email via client_referer
5.4
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 10% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
HA
HappyForms ·
before 1.26.15 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-14556
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-14556
wpscan.com
https://wpscan.com/vulnerability/7673862c-b37c-4c7e-af3f-c32cbd2deb23/
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Happyforms < 1.26.3 - Admin+ Stored XSS