Vulnerability · Published Sep 6, 2026 · Assigned by WPScan

CVE-2026-19862JetFormBuilder < 3.6.5.2 - Unauthenticated Email Header Injection via Send Email Action

Medium 4.8

In plain English

A medium-severity security flaw in JetFormBuilder 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 16% of all known vulnerabilities).

Severity (CVSS 3.1)4.8Medium

Exploit odds (30 days)0.2%top 84.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

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.

Affected products (as reported)

Vendor	Product	Versions
Unknown	JetFormBuilder	0 – before 3.6.5.2

Weakness: CWE-93 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

References

wpscan.com exploit, vdb-entry, technical-description