CVE-2026-69153

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.

• CWE-22
• CWE-200

• https://github.com/postcss/postcss/commit/7beca139e70f9075c6b19700fcb00dd8033e5da8Patch
• https://github.com/postcss/postcss/releases/tag/8.5.19Product, Release Notes
• https://github.com/postcss/postcss/security/advisories/GHSA-fxqj-rqcc-2cmpExploit, Mitigation, Vendor Advisory
• https://github.com/postcss/postcss/security/advisories/GHSA-fxqj-rqcc-2cmpExploit, Mitigation, Vendor Advisory

Published

Aug 3, 2026

Last Modified

Aug 5, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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