CVE-2024-6243Public exploitNetwork attack vector

Stored XSS via unescaped form messages

Published Jul 22, 2024 · Updated Aug 1, 2024

Stored XSS in HTML Forms before 1.3.33 allows remote authenticated users to inject scripts through configurable form messages. The form editor stores message inputs without sanitizing them and later renders those values without output escaping. Administrator-level access is required to store the payload, and a visitor must submit the form and interact with the displayed message to execute it.

CVSS severity4.8
Medium
EPSS probability0.35%
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 HTML Forms before 1.3.33 allows remote authenticated users to inject scripts through configurable form messages. The form editor stores message inputs without sanitizing them and later renders those values without output escaping. Administrator-level access is required to store the payload, and a visitor must submit the form and interact with the displayed message to execute it.

The record

CVE
CVE-2024-6243
Published
Jul 22, 2024
Updated
Aug 1, 2024
Vendor
Link Software LLC
Product
HTML Forms
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Jul 22, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 1, 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=0 <1.3.33

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Link Software LLC · HTML Formsversion=0 <1.3.33

Published CVSS scores

4.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
5.9CISA-ADPCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:L

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')
T1059.007JavaScript/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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