CVE-2024-6390Public exploitNetwork attack vector

Stored XSS via unescaped retake button label

Published Aug 3, 2024 · Updated Aug 5, 2024

Stored XSS in the Retake Quiz Button label in ExpressTech Systems Quiz and Survey Master before 9.1.0 allows remote authenticated users to run script. The label accepts an event-handler payload that is stored and emitted into the button without adequate sanitization or output escaping. Contributor access is required to edit a quiz, and a visitor must submit or preview the quiz and move the pointer over the retake button.

CVSS severity5.9
Medium
EPSS probability0.33%
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 the Retake Quiz Button label in ExpressTech Systems Quiz and Survey Master before 9.1.0 allows remote authenticated users to run script. The label accepts an event-handler payload that is stored and emitted into the button without adequate sanitization or output escaping. Contributor access is required to edit a quiz, and a visitor must submit or preview the quiz and move the pointer over the retake button.

The record

CVE
CVE-2024-6390
Published
Aug 3, 2024
Updated
Aug 5, 2024
Vendor
ExpressTech Systems
Product
Quiz and Survey Master
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 3, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=0 <9.1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

ExpressTech Systems · Quiz and Survey Masterversion=0 <9.1.0

Published CVSS scores

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.

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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')
T1059.007Command and Scripting Interpreter: JavaScript

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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