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Medium severity6.1NVD Advisory· Published Apr 24, 2026· Updated Jun 17, 2026

CVE-2026-41305

CVE-2026-41305

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 ` sequences when stringifying CSS ASTs. When user-submitted CSS is parsed and re-stringified for embedding in HTML ` in CSS values breaks out of the style context, enabling XSS. Version 8.5.10 fixes the issue.

AI Insight

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
postcssnpm
< 8.5.108.5.10

Affected products

55

Patches

Vulnerability mechanics

References

4

News mentions

0

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