Cross-site scripting in Postcss - CVE-2026-41305
Published: April 24, 2026
Vulnerability identifier: #VU127462
CSH Severity: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Green
CVE-ID: CVE-2026-41305
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Postcss
Postcss
Software vendor:
Postcss
Postcss
Description
The vulnerability allows a remote attacker to execute arbitrary script in a victim's browser.
The vulnerability exists due to cross-site scripting in CSS stringify output when embedding re-stringified user-supplied CSS in HTML style tags. A remote attacker can supply crafted CSS containing an unescaped closing style sequence to execute arbitrary script in a victim's browser.
User interaction is required to load the generated HTML.
Remediation
Install security update from vendor's website.