CVE-2021-20792Network attack vector

Browser script execution via reflected query parameters

Published Aug 18, 2021 · Updated Aug 3, 2024

Reflected XSS in ExpressTech Systems Quiz and Survey Master before 7.1.14 allows remote attackers to execute script in a user's browser. The quizzes administration page places attacker-controlled URL query parameters into its HTML response without output escaping. Exploitation requires a user with access to the quiz list to open a crafted URL; the script then runs in the site's origin and can read or alter session-accessible data.

CVSS severity6.1
Medium
EPSS probability3.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Reflected XSS in ExpressTech Systems Quiz and Survey Master before 7.1.14 allows remote attackers to execute script in a user's browser. The quizzes administration page places attacker-controlled URL query parameters into its HTML response without output escaping. Exploitation requires a user with access to the quiz list to open a crafted URL; the script then runs in the site's origin and can read or alter session-accessible data.

The record

CVE
CVE-2021-20792
Published
Aug 18, 2021
Updated
Aug 3, 2024
Vendor
ExpressTech Systems
Product
Quiz and Survey Master
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 18, 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

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=versions prior to 7.1.14

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ExpressTech Systems · Quiz and Survey Masterversion=versions prior to 7.1.14

Published CVSS scores

2.6JPCERT/CCAV:N/AC:H/Au:N/C:N/I:P/A:N
6.1JPCERT/CCCVSS:3.0/AV:N/AC:L/PR:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo