Vulnerability · Published Oct 21, 2026 · Assigned by WPScan
CVE-2026-14556HappyForms < 1.26.15 - Unauthenticated HTML Injection in Admin Notification Email via client_referer
Medium 5.4
In plain English
A medium-severity security flaw in HappyForms from Unknown. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 10% of all known vulnerabilities).
Severity (CVSS 3.1)5.4Medium
Exploit odds (30 days)0.2%top 89.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Unknown | HappyForms | 0 – before 1.26.15 |
Weakness: CWE-116 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
References
- https://wpscan.com/vulnerability/7673862c-b37c-4c7e-af3f-c32cbd2deb23/ exploit, vdb-entry, technical-description