Vulnerability record · CVE-2026-69153 · published 3 August 2026

CVE-2026-69153: Postcss path traversal vulnerability

Postcss · Postcss

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.

6.3 CVSS 4.0 Medium EPSS 0.45% · top 63.3% CWE-22 · Path traversalCWE-200 · Information exposure

6.3CVSS 4.0 base score

0.45%EPSS exploitation probability, 30 days

NoNot in CISA KEV

1Affected product versions listed by NVD

4References, 2 tagged exploit

5 Aug 2026Last modified by NVD

Description

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

Postcss Postcss

References

Link	Tags
https://github.com/postcss/postcss/commit/7beca139e70f9075c6b19700fcb00dd8033e5da8	Patch
https://github.com/postcss/postcss/releases/tag/8.5.19	ProductRelease Notes
https://github.com/postcss/postcss/security/advisories/GHSA-fxqj-rqcc-2cmp	ExploitMitigationVendor Advisory
https://github.com/postcss/postcss/security/advisories/GHSA-fxqj-rqcc-2cmp	ExploitMitigationVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-69153), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.