CVE-2021-24513Public exploitNetwork attack vector

Stored script execution via unescaped form titles

Published Sep 6, 2021 · Updated Aug 3, 2024

Stored XSS in Form Builder | Create Responsive Contact Forms before 1.9.8.4 allows remote authenticated users to run scripts via a form title. The form-title save path stores title input without sanitization, and the administrative form view renders that value without output escaping. Administrator privileges are required to save the payload; it then runs when the stored form is viewed or edited in the dashboard, even if unfiltered_html is disabled.

CVSS severity5.4
Medium
EPSS probability0.62%
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 Form Builder | Create Responsive Contact Forms before 1.9.8.4 allows remote authenticated users to run scripts via a form title. The form-title save path stores title input without sanitization, and the administrative form view renders that value without output escaping. Administrator privileges are required to save the payload; it then runs when the stored form is viewed or edited in the dashboard, even if unfiltered_html is disabled.

The record

CVE
CVE-2021-24513
Published
Sep 6, 2021
Updated
Aug 3, 2024
Vendor
Muneeb
Product
Form Builder | Create Responsive Contact Forms
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Sep 6, 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

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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=1.9.8.4 <1.9.8.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Muneeb · Form Builder | Create Responsive Contact Formsversion=1.9.8.4 <1.9.8.4

Published CVSS scores

5.4NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
3.5NVDAV:N/AC:M/Au:S/C:N/I:P/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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript/JScript

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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