CVE-2026-73646

A flaw was found in PostCSS. An attacker can exploit a path traversal vulnerability by providing specially crafted sourceMappingURL values in untrusted CSS files. This allows the attacker to disclose sensitive sourcesContent from arbitrary .map files accessible on the system, leading to informati...

SUSE 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...

SUSE CVE-2026-73646

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 8.5.18, lib/previous-map.js loadMap passes attacker-controlled sourceMappingURL values to joindirnameopts.from, annotation, and loadFile permits traversed ...

CVE-2026-73646

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 8.5.18, lib/previous-map.js loadMap passes attacker-controlled sourceMappingURL values to joindirnameopts.from, annotation, and loadFile permits traversed ...

CVE-2026-73646 PostCSS: Path Traversal in Previous Source Map Auto-Loading (sourceMappingURL) leads to Arbitrary .map File Disclosure

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 8.5.18, lib/previous-map.js loadMap passes attacker-controlled sourceMappingURL values to joindirnameopts.from, annotation, and loadFile permits traversed ...

EUVD-2026-60239

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 8.5.18, lib/previous-map.js loadMap passes attacker-controlled sourceMappingURL values to joindirnameopts.from, annotation, and loadFile permits traversed ...

CVE-2026-73646

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 8.5.18, lib/previous-map.js loadMap passes attacker-controlled sourceMappingURL values to joindirnameopts.from, annotation, and loadFile permits traversed ...

CVE-2026-73646 PostCSS: Path Traversal in Previous Source Map Auto-Loading (sourceMappingURL) leads to Arbitrary .map File Disclosure

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 8.5.18, lib/previous-map.js loadMap passes attacker-controlled sourceMappingURL values to joindirnameopts.from, annotation, and loadFile permits traversed ...

CVE-2026-73646 PostCSS: Path Traversal in Previous Source Map Auto-Loading (sourceMappingURL) leads to Arbitrary .map File Disclosure

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 8.5.18, lib/previous-map.js loadMap passes attacker-controlled sourceMappingURL values to joindirnameopts.from, annotation, and loadFile permits traversed ...

postcss: PostCSS: Information disclosure via path traversal in source map auto-loading

A flaw was found in PostCSS. An attacker can exploit a path traversal vulnerability by providing specially crafted sourceMappingURL values in untrusted CSS files. This allows the attacker to disclose sensitive sourcesContent from arbitrary .map files accessible on the system, leading to informati...

postcss: PostCSS: Information disclosure via crafted sourceMappingURL

A flaw was found in PostCSS. A remote attacker can exploit this vulnerability by providing a specially crafted sourceMappingURL when a specific configuration the 'from' parameter is not set. This can cause the application to read and expose unintended source-map files, potentially revealing...

postcss: PostCSS: Information disclosure via path traversal in source map auto-loading

A flaw was found in PostCSS. An attacker can exploit a path traversal vulnerability by providing specially crafted sourceMappingURL values in untrusted CSS files. This allows the attacker to disclose sensitive sourcesContent from arbitrary .map files accessible on the system, leading to informati...

postcss: PostCSS: Information disclosure via crafted sourceMappingURL

A flaw was found in PostCSS. A remote attacker can exploit this vulnerability by providing a specially crafted sourceMappingURL when a specific configuration the 'from' parameter is not set. This can cause the application to read and expose unintended source-map files, potentially revealing...

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...

PT-2026-67450

Name of the Vulnerable Software and Affected Versions PostCSS versions prior to 8.5.19 Description PostCSS transforms CSS files into an Abstract Syntax Tree to allow analysis and modification. When the from option is unset, the PreviousMap.loadFile function fails to properly validate the...

Information Disclosure at postcss Dependency in Bamboo Data Center

This High severity Information Disclosure vulnerability was introduced in versions 10.0.0, 10.1.0, 10.2.0, 11.0.0, 12.0.0, and 12.1.0 of Bamboo Data Center. This Information Disclosure vulnerability, with a CVSS Score of 7.5 and a CVSS Vector of CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N allows...

CVE-2026-45623

PostCSS takes a CSS file and provides an API to analyze and modify its rules by transforming the rules into an Abstract Syntax Tree. In versions 8.5.11 and prior, the PreviousMap parses the / sourceMappingURL=PATH / comment from any CSS string passed to process and dereferences PATH against the...

CVE-2026-45623

PostCSS takes a CSS file and provides an API to analyze and modify its rules by transforming the rules into an Abstract Syntax Tree. In versions 8.5.11 and prior, the PreviousMap parses the / sourceMappingURL=PATH / comment from any CSS string passed to process and dereferences PATH against the...

Directory Traversal

Overview org.webjars.npm:postcss is a PostCSS is a tool for transforming styles with JS plugins. Affected versions of this package are vulnerable to Directory Traversal via the loadMap process. An attacker can access the contents of arbitrary .map files on the filesystem by submitting crafted CSS...

PostCSS: Arbitrary file read and information disclosure via attacker-controlled sourceMappingURL in CSS comments

Summary PostCSS's PreviousMap parses the / sourceMappingURL=PATH / comment from any CSS string passed to process and dereferences PATH against the local filesystem with no scheme, allowlist, or traversal check. An attacker who controls the CSS input can cause the host process to read any file...