Path traversal in Postcss - CVE-2026-69153
Published: September 9, 2026
Vulnerability identifier: #VU148847
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-69153
CWE-ID: CWE-22
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform directory traversal attacks.
The vulnerability exists due to PostCSS takes a CSS file and provides an API to analyze and modify its rules by transforming the rules into an Abstract Syntax Tree. A remote attacker can send a specially crafted HTTP request and read arbitrary files on the system.
Affected software
Postcss
How to mitigate CVE-2026-69153
Install updates from vendor's website.
Postcss - update to 8.5.19