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 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 v3 5.3 MEDIUM

5.3^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 3.9 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/postcss/postcss/commit/7beca139e70f9075c6b19700fcb00dd8033e5da8	Patch
https://github.com/postcss/postcss/releases/tag/8.5.19	Product Release Notes
https://github.com/postcss/postcss/security/advisories/GHSA-fxqj-rqcc-2cmp	Exploit Mitigation Vendor Advisory
https://github.com/postcss/postcss/security/advisories/GHSA-fxqj-rqcc-2cmp	Exploit Mitigation Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:postcss:postcss:*:*:*:*:*:node.js:*:*

History

No history.

Information

Published : 2026-08-03 17:16

Updated : 2026-08-05 14:58

NVD link : CVE-2026-69153

Mitre link : CVE-2026-69153

CVE.ORG link : CVE-2026-69153

JSON object : View

Products Affected

postcss

postcss

CWE

CWE-22

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

CWE-200

Exposure of Sensitive Information to an Unauthorized Actor

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