PT-2026-67450 · Postcss · Postcss

CVE-2026-69153 · Published 2026-08-03 · Updated 2026-08-03

NVD

CVSS v4.0

6.3

Medium

Base vector

AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

PostCSS takes a CSS file and provides an API to analyze and modify its rules by transforming the rules into an Abstract Syntax Tree. Prior to 8.5.19, if from is unset, an attacker can cause PreviousMap.loadFile() to read an unintended source-map file by supplying an absolute or directory-traversal sourceMappingURL. The resulting map’s sources and sourcesContent may then be exposed to the application. This issue is fixed in version 8.5.19.

Exploit

Fix

Information Disclosure

Path traversal

Weakness Enumeration

CWE-200

CWE-22

Related Identifiers

CVE-2026-69153

Affected Products

Postcss

References · 4

• 🔥 https://github.com/postcss/postcss/security/advisories/GHSA-fxqj-rqcc-2cmp · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2026-69153 · Security Note
• https://github.com/postcss/postcss/commit/7beca139e70f9075c6b19700fcb00dd8033e5da8 · Note
• https://github.com/postcss/postcss/releases/tag/8.5.19 · Note