CVE-2024-13383Public exploitNetwork attack vector

Stored XSS via unescaped quiz fields

Published May 15, 2025 · Updated May 20, 2025

Stored cross-site scripting in Harmonic Design HD Quiz before 2.0.0 allows remote authenticated users to inject scripts through quiz fields. Question and answer values accept event-handler markup without adequate sanitization or output escaping, then render the stored payload when a quiz page is viewed. Editor-level access is required, and exploitation is limited to multisite installations or sites where unfiltered_html is disabled; a visitor must load the injected page.

CVSS severity4.8
Medium
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in Harmonic Design HD Quiz before 2.0.0 allows remote authenticated users to inject scripts through quiz fields. Question and answer values accept event-handler markup without adequate sanitization or output escaping, then render the stored payload when a quiz page is viewed. Editor-level access is required, and exploitation is limited to multisite installations or sites where unfiltered_html is disabled; a visitor must load the injected page.

The record

CVE
CVE-2024-13383
Published
May 15, 2025
Updated
May 20, 2025
Vendor
Harmonic Design
Product
HD Quiz
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 15, 2025CVE publishedPublication date reported by the CVE source.
  2. May 20, 2025Record 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 <2.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Harmonic Design · HD Quizversion=0 <2.0.0

Published CVSS scores

4.4WordfenceCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:N
4.8CISA ADPCVSS:3.1/AV:N/AC:L/PR:H/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
Privilegesauthenticated
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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