CVE-2021-24967Public exploitNetwork attack vector

Stored XSS via unsanitized lead values

Published Dec 27, 2021 · Updated Aug 3, 2024

Stored XSS in ThemeHunk Lead Form Builder & Contact Form before 1.6.4 allows remote attackers to run script in an administrator's browser. The unauthenticated Save_Form_Data AJAX action stores crafted lead fields, including name_1, without sanitizing or escaping them before the leads page renders the values. Execution requires a logged-in administrator to view the inserted lead and is bounded to that administrator's browser context.

CVSS severity6.1
Medium
EPSS probability1.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in ThemeHunk Lead Form Builder & Contact Form before 1.6.4 allows remote attackers to run script in an administrator's browser. The unauthenticated Save_Form_Data AJAX action stores crafted lead fields, including name_1, without sanitizing or escaping them before the leads page renders the values. Execution requires a logged-in administrator to view the inserted lead and is bounded to that administrator's browser context.

The record

CVE
CVE-2021-24967
Published
Dec 27, 2021
Updated
Aug 3, 2024
Vendor
ThemeHunk
Product
Lead Form Builder & Contact Form
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 27, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=1.6.4 <1.6.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ThemeHunk · Lead Form Builder & Contact Formversion=1.6.4 <1.6.4

Published CVSS scores

4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/A:N
6.1NIST NVDCVSS: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 exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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