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Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') in postcss

CVE-2026-69153

  • postcss
Medium
6.3/10

Summary

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 8.5.23, 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 maps sources and sourcesContent may then be exposed to the application.

  • LOW
  • NETWORK
  • NONE
  • UNCHANGED
  • NONE
  • NONE
  • LOW
  • NONE

CWE-22 - Path Traversal

Path traversal (or directory traversal), is a vulnerability that allows malicious users to traverse the server's root directory, gaining access to arbitrary files and folders such as application code & data, back-end credentials, and sensitive operating system files. In the worst-case scenario, an attacker could potentially execute arbitrary files on the server, resulting in a denial of service attack. Such an exploit may severely impact the integrity, confidentiality, and availability of an application.

References

Advisory Timeline

  • Published