CVE-2021-24153

PoC —

CVSS 3.1

5.4 medium

EPSS

1%p64

Published

Apr 5, 2021 (Apr 5, 2021)

Modified

Jun 17, 2026

Description

A Stored Cross-Site Scripting vulnerability was discovered in the Yoast SEO WordPress plugin before 3.4.1, which had built-in blacklist filters which were blacklisting Parenthesis as well as several functions such as alert but bypasses were found.

Vendors: yoast
Products: yoast seo
Ecosystems: WordPress
Weakness: CWE-79
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

NVD CVE.org GitHub PoCs EPSS (1.1%)

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