What’s Vulnerable › Vulnerabilities
CVE-2026-14556: HappyForms < 1.26.15 - Unauthenticated HTML Injection in Admin Notification Email via client_referer
- Severity: medium (CVSS 5.4 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-10-21 · updated 2026-10-21
- Weakness: CWE-116
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
- Happyforms: before 1.26.15 — fixed in 1.26.15
How to fix
Upgrade to a fixed version: Happyforms 1.26.15. Check the vendor advisory for mitigations.
References
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