CVE-2026-19862

JetFormBuilder < 3.6.5.2 - Unauthenticated Email Header Injection via Send Email Action

Published Sep 6, 2026 CVSS 3.1 · 4.8 Medium EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Formbuilder Project
Formbuilder Project formbuilder
Wordpress
Wordpress wordpress
Vendors & Products Formbuilder Project
Formbuilder Project formbuilder
Wordpress
Wordpress wordpress
Type Values Removed Values Added
Weaknesses CWE-93
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title JetFormBuilder < 3.6.5.2 - Unauthenticated Email Header Injection via Send Email Action
References
Metrics cvssV3_1

{'score': 4.8, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
WPScan
Published
Updated
Sep 6, 2026, 10:43 AM
Reserved
Aug 14, 2026, 10:01 AM
Status
Deferred
Published
Sep 6, 2026, 10:17 AM
Modified
Sep 8, 2026, 7:09 PM