CVE-2021-23974

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CVSS 3.1

6.1 medium

EPSS

<1%p53

Published

Feb 26, 2021 (Feb 26, 2021)

Modified

Jun 17, 2026

Description

The DOMParser API did not properly process ' ' elements for escaping. This could be used as an mXSS vector to bypass an HTML Sanitizer. This vulnerability affects Firefox < 86.

Vendors: mozilla
Products: firefox
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

NVD CVE.org GitHub PoCs EPSS (0.8%)

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