CVE-2026-19862 JetFormBuilder < 3.6.5.2 - Unauthenticated Email Header Injection via Send Email Action
Unauthenticated attackers can inject email headers in JetFormBuilder if configured to use form fields for addresses, enabling sender spoofing and hidden recipients.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-19862?
CVE-2026-19862 is a medium-severity vulnerability in Unknown JetFormBuilder, published on 6 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The JetFormBuilder WordPress plugin before 3.6.5.2 does not validate or strip line breaks from address values it sources from submitted form fields before adding them to the headers of the e-mails it sends, allowing unauthenticated users to inject arbitrary e-mail headers, add hidden recipients and spoof the sender. Exploitation requires the site to be configured to take one of the message's addresses from a form field.
Weakness: CWE-93
Which versions are affected by CVE-2026-19862?
How do I fix CVE-2026-19862?
No fix has been published for CVE-2026-19862 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-19862 being exploited?
There is no known exploitation of CVE-2026-19862 in the wild and no public exploit code.
Sources
Also known as GHSA-9qrj-jm5v-82p9.