CVE-2026-69153: Path Traversal

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.

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Weakness Type (CWE)

CWE-22 Path Traversal

CWE-200 CWE-200

References

Other References

https://github.com/postcss/postcss/commit/7beca139e70f9075c6b19700fcb00dd8033e5da8 https://github.com/postcss/postcss/releases/tag/8.5.19 https://github.com/postcss/postcss/security/advisories/GHSA-fxqj-rqcc-2cmp https://github.com/postcss/postcss/security/advisories/GHSA-fxqj-rqcc-2cmp

Frequently Asked Questions

What is 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.

How do I check if I'm vulnerable to CVE-2026-69153? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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