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CVE-2026-41305

NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-41305

Severity

6.1

Medium

CVSS V3

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Summary

PostCSS has XSS via Unescaped </style> in its CSS Stringify Output

Description

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-submitted CSS is parsed and re-stringified for embedding in HTML <style> tags, </style> in CSS values breaks out of the style context, enabling XSS. Version 8.5.10 fixes the issue.

References

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