CVE-2021-24691Public exploitNetwork attack vector

Stored XSS via unescaped Quiz URL Slug

Published Oct 11, 2021 · Updated Aug 3, 2024

Stored XSS in Quiz and Survey Master before 7.3.2 allows remote authenticated users to execute script via the Quiz URL Slug setting. The plugin stores that administrator-controlled setting and outputs it on quiz pages without context-appropriate escaping, so injected markup becomes executable browser content. High-privilege access is required to change the setting, and script execution occurs when a user opens an affected page.

CVSS severity4.8
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 Quiz and Survey Master before 7.3.2 allows remote authenticated users to execute script via the Quiz URL Slug setting. The plugin stores that administrator-controlled setting and outputs it on quiz pages without context-appropriate escaping, so injected markup becomes executable browser content. High-privilege access is required to change the setting, and script execution occurs when a user opens an affected page.

The record

CVE
CVE-2021-24691
Published
Oct 11, 2021
Updated
Aug 3, 2024
Vendor
ExpressTech Systems
Product
Quiz and Survey Master
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Oct 11, 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=7.3.2 <7.3.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

ExpressTech Systems · Quiz and Survey Masterversion=7.3.2 <7.3.2

Published CVSS scores

4.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
3.5NIST NVDAV: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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

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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