JetFormBuilder < 3.6.5.2 - Unauthenticated Email Header Injection via Send Email Action (CVE-2026-19862) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-19862

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

Answer in brief

CVE-2026-19862 records a Unknown severity vulnerability in JetFormBuilder < 3.6.5.2 - Unauthenticated Email Header Injection via Send Email Action. The current sources do not mark it as known exploited. The current feed maps Unknown/JetFormBuilder (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 6, 2026Updated Sep 6, 2026Source checked Sep 6, 2026First seen by HOL Sep 6, 2026Material review Sep 6, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Unknown/JetFormBuilder (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Unknown/JetFormBuildergeneric	>=0 <3.6.5.2	3.6.5.2

Recommended response

Check inventory. Check lockfiles and deployed manifests for Unknown/JetFormBuilder.
Review the reported fix. Update Unknown/JetFormBuilder to 3.6.5.2 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 6, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 6, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 6, 2026

Sources and claim methodology

Source referencewpscan.com

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.