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 `` tags, `` in CSS values breaks out of the style context, enabling XSS. Version 8.5.10 fixes the issue.
Details
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Affected Packages
| Software | From version | Fixed in |
|---|---|---|
| postcss | โ | โ |
| unknown | โ | โ |
References
Similar Threats
- Medium ROOT-APP-NPM-CVE-2026-41305
- High ROOT-APP-NPM-CVE-2021-23382
- Medium ROOT-APP-NPM-CVE-2023-44270
- Unknown MAL-2025-188773
- Unknown MAL-2025-188774
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