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Vulnerability record · CVE-2023-44270 · published 29 September 2023

CVE-2023-44270: Postcss injection vulnerability

Postcss · Postcss

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.

5.3 CVSS 3.1 Medium EPSS 0.82% · top 44.4% CWE-74 · Injection
5.3CVSS 3.1 base score
0.82%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
9References
17 Jun 2026Last modified by NVD

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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/github/advisory-database/issues/2820 Issue Tracking
https://github.com/postcss/postcss/blob/main/lib/tokenize.js#L25 Issue Tracking
https://github.com/postcss/postcss/commit/58cc860b4c1707510c9cd1bc1fa30b423a9ad6c5 Patch
https://github.com/postcss/postcss/releases/tag/8.4.31 PatchRelease Notes
https://github.com/github/advisory-database/issues/2820 Issue Tracking
https://github.com/postcss/postcss/blob/main/lib/tokenize.js#L25 Issue Tracking
https://github.com/postcss/postcss/commit/58cc860b4c1707510c9cd1bc1fa30b423a9ad6c5 Patch
https://github.com/postcss/postcss/releases/tag/8.4.31 PatchRelease Notes
https://lists.debian.org/debian-lts-announce/2024/12/msg00025.html

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2023-44270), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.