CVE-2021-24571: HD Quiz < 1.8.4 - Authenticated Stored XSS

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2021-08-23 · updated 2026-06-17
Weakness: CWE-79

Description

The HD Quiz WordPress plugin before 1.8.4 does not escape some of its Answers before outputting them in attribute when generating the Quiz, which could lead to Stored Cross-Site Scripting issues

Affected products

Harmonic Design HD Quiz: before 1.8.4 — fixed in 1.8.4

How to fix

Upgrade to a fixed version: Harmonic Design HD Quiz 1.8.4. Check the vendor advisory for mitigations.

References

https://wpscan.com/vulnerability/377fd65f-3a8c-4f7a-9e40-046d52ec0eef
https://wpscan.com/vulnerability/377fd65f-3a8c-4f7a-9e40-046d52ec0eef

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