CVE-2026-69153

Medium

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. 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.

SeverityMedium

CVSS5.3

Exploit probability—

ProductPostcss

PublishedAug 3, 2026

First seenAug 3, 2026

Weakness typeCWE-22Path traversal CWE-200Sensitive information exposure

How to fix

Update

postcss postcss8.5.23 or later
postcss8.5.23 or later

Affected products

Product	Affected versions	Fixed in
postcss postcss	v < 8.5.23	8.5.23
postcssnpm	v < 8.5.23	8.5.23

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