CVE-2026-69153mediumCWE-200CWE-22

CVE-2026-69153: medium-severity vulnerability in postcss

PostCSS: incomplete fix of CVE-2026-45623 — attacker-controlled sourceMappingURL reads arbitrary .map files when `from` is unset

Published

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13Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 6.3epss 0.5%
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:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Affected products
postcss · postcss
Related CVEs — postcss

In the same product, most dangerous first.

CVE-2026-45623HIGHPostCSS: Arbitrary file read and information disclosure via attacker-controlled sourceMappingURL in CSS commentsEPSS 0.6%CVE-2026-73646HIGHPostCSS: Path Traversal in Previous Source Map Auto-Loading (sourceMappingURL) leads to Arbitrary .map File DisclosureEPSS 0.5%CVE-2026-41305MEDIUMPostCSS has XSS via Unescaped </style> in its CSS Stringify OutputEPSS 0.2%