{"cve":"CVE-2023-44270","nvd":{"published":"2023-09-29T22:15:11.867","modified":"2026-06-17T06:27:15.690","status":"Modified","description":"An issue was discovered in PostCSS before 8.4.31. The vulnerability affects linters using PostCSS to parse external untrusted CSS. An attacker can prepare CSS in such a way that it will contains parts parsed by PostCSS as a CSS comment. After processing by PostCSS, it will be included in the PostCSS output in CSS nodes (rules, properties) despite being included in a comment.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","score":5.3},"cwes":["CWE-74"],"references":["https://github.com/github/advisory-database/issues/2820","https://github.com/postcss/postcss/blob/main/lib/tokenize.js#L25","https://github.com/postcss/postcss/commit/58cc860b4c1707510c9cd1bc1fa30b423a9ad6c5","https://github.com/postcss/postcss/releases/tag/8.4.31","https://github.com/github/advisory-database/issues/2820"],"products":["postcss:postcss"],"source":"nvd","synced_at":"2026-10-19T21:39:34.467980132+00:00"},"epss":{"cve":"CVE-2023-44270","score":0.00973,"percentile":0.62035,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-7fh5-64p2-3v2j","url":"https://osv.dev/vulnerability/GHSA-7fh5-64p2-3v2j","summary":"PostCSS line return parsing error","modified":"2026-09-10T03:49:57.862104145Z","packages":[{"ecosystem":"npm","name":"postcss","purl":"pkg:npm/postcss","ranges":["<8.4.31"],"fixed":["8.4.31"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}