CVE-2021-20792

Quiz and Survey Master <= 7.1.13 - Cross-Site Scripting

2021-09-13 00:00

Strategic Overview

Status: Patched in 7.1.14
Affected Plugin: Quiz and Survey Master (QSM) – Quiz Maker & Survey Maker
Affected Version: <= 7.1.13
CVSS: 6.1Medium
Weakness type: CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE: CVE-2021-20792

View all Quiz and Survey Master (QSM) – Quiz Maker & Survey Maker vulnerabilities

At a glance

CVE-2021-20792 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the Quiz and Survey Master (QSM) WordPress plugin, affecting versions <= 7.1.13. It carries a CVSS score of 6.1 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 7.1.14; sites on affected versions should update now. Disclosed September 2021, reported by Gen Sato.

Vulnerability Overview

Cross-site scripting vulnerability in Quiz And Survey Master versions prior to 7.1.14 allows a remote attacker to inject arbitrary script via unspecified vectors.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no privileges on the target site.

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Reaching this weakness in Quiz and Survey Master (QSM) <= 7.1.13 takes a caller who can reach the endpoint. Cross-site scripting happens when input from a request is written into a page without being escaped for the context it lands in, so the browser parses attacker-supplied text as markup or script.

Injected script runs with the privileges of whoever views the affected page, which is how these flaws turn into administrator session theft, silent account creation or persistent backdoors in page content. For Quiz and Survey Master (QSM) the fix is 7.1.14: builds <= 7.1.13 are affected, anything from 7.1.14 onward is not.

Remediation

Update to version 7.1.14, or a newer patched version

How does WordSec protect against this?

The attempt arrives as an ordinary request to Quiz and Survey Master (QSM): WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Quiz and Survey Master (QSM) 7.1.14 closes this, and updating the plugin is the step that ends it.

Firewall
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2021-20792 https://www.wordfence.com/threat-intel/vulnerabilities/id/fca4040d-3c6c-4e31-9bed-d1b6bf5b2bed https://nvd.nist.gov/vuln/detail/CVE-2021-20792

Related records

Same weakness class

Other vulnerabilities in Quiz and Survey Master (QSM) – Quiz Maker & Survey Maker

CVSS Vector

6.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionRequired
ScopeChanged
ConfidentialityLow
IntegrityLow
AvailabilityNone

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