CVE-2026-69153

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 8.5.19, 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.

Affected Software

Weaknesses

• CWE-22: CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
• CWE-200: CWE-200: Exposure of Sensitive Information to an Unauthorized Actor

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: no
  • Technical Impact: partial

Additional References

• https://github.com/postcss/postcss/security/advisories/GHSA-fxqj-rqcc-2cmp

References

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

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