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.

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Fixes

Solution

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Workaround

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History

Sun, 06 Sep 2026 09:45:00 +0000

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'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: WPScan

Published:

Updated: 2026-09-06T10:43:40.381Z

Reserved: 2026-08-14T10:01:01.293Z

Link: CVE-2026-19862

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-09-06T10:17:14.563

Modified: 2026-09-06T10:17:14.563

Link: CVE-2026-19862

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-06T10:30:05Z

Weaknesses

No weakness.