CVE-2026-41305

postcss: PostCSS: Cross-Site Scripting (XSS) via improper escaping of style closing tags

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Severity

Moderate

Red Hat Product Security

6.1

CVSS 3.1

Review impact separately from score.

Published · April 24, 2026

Updated · November 1, 2026

Description

A flaw was found in PostCSS. This vulnerability allows a remote attacker to perform Cross-Site Scripting (XSS) by submitting specially crafted CSS. When PostCSS processes and re-stringifies this CSS for embedding within HTML sequences. This oversight enables the injected to prematurely close the HTML style block, allowing the attacker to inject malicious scripts and execute arbitrary code in the user's browser context.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 6.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CWE-79 · Improper Neutralization of Input During Web Page Generation