What is CVE-2026-41305?

CVE-2026-41305 is a medium-severity vulnerability in Postcss, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-04-24.

How severe is CVE-2026-41305?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Postcss

CVE-2026-41305

PostCSS takes a CSS file and provides an API to analyze and modify its rules by transforming the rules into an Abstract Syntax Tree. Versions prior to 8.5.10 do not escape `</style>` sequences when stringifying CSS ASTs. When user-submitte…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.002 (10.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

Affected products

Postcss — versions < 8.5.10

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

security-advisories@github.com (x_refsource_CONFIRM)
security-advisories@github.com (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-41305?: CVE-2026-41305 is a medium-severity vulnerability in Postcss, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-04-24.
How severe is CVE-2026-41305?: Medium severity. CVSS v3 base score is 6.1 out of 10.