Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Postcss | Postcss | < 8.5.23 |
Related Weaknesses (CWE)
References
- https://github.com/postcss/postcss/commit/7beca139e70f9075c6b19700fcb00dd8033e5dPatch
- https://github.com/postcss/postcss/releases/tag/8.5.19ProductRelease Notes
- https://github.com/postcss/postcss/security/advisories/GHSA-fxqj-rqcc-2cmpExploitMitigationVendor Advisory
- https://github.com/postcss/postcss/security/advisories/GHSA-fxqj-rqcc-2cmpExploitMitigationVendor Advisory
FAQ
What is CVE-2026-69153?
CVE-2026-69153 is a vulnerability with a CVSS score of 5.3 (MEDIUM). 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 PreviousMa...
How severe is CVE-2026-69153?
CVE-2026-69153 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-69153?
Check the references section above for vendor advisories and patch information. Affected products include: Postcss Postcss.