CVE-2026-19861Network attack vector

Unauthenticated email HTML injection via unescaped WYSIWYG values

Published Sep 5, 2026 · Updated Sep 6, 2026

Cross-site scripting in Crocoblock JetFormBuilder before 3.6.5.2 allows remote attackers to inject HTML into notification emails. The Send Email action places an unauthenticated WYSIWYG field value into an HTML message without sufficient sanitization or output escaping. Any public form using that field and notification action exposes recipients to rendered attacker-controlled markup; script execution depends on the mail client.

CVSS severity6.1
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Crocoblock JetFormBuilder before 3.6.5.2 allows remote attackers to inject HTML into notification emails. The Send Email action places an unauthenticated WYSIWYG field value into an HTML message without sufficient sanitization or output escaping. Any public form using that field and notification action exposes recipients to rendered attacker-controlled markup; script execution depends on the mail client.

The record

CVE
CVE-2026-19861
Published
Sep 5, 2026
Updated
Sep 6, 2026
Vendor
Crocoblock
Product
JetFormBuilder
Classifications
CWE-79
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 6, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <3.6.5.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Crocoblock · JetFormBuilderversion=0 <3.6.5.2

Published CVSS scores

5.0TenableAV:N/AC:L/Au:N/C:N/I:P/A:N
6.1TenableCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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