SB2026042418 - Cross-site scripting in Postcss

Description

This security bulletin contains information about 1 vulnerability.

1) Cross-site scripting (CVE-ID: CVE-2026-41305)

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVSSv4: 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

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 update from vendor's website.

References

• https://github.com/postcss/postcss/security/advisories/GHSA-qx2v-qp2m-jg93
• https://github.com/advisories/GHSA-qx2v-qp2m-jg93