CVE-2026-69153: postcss Path Traversal

Description

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.

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CVSS v3.1 Score

5.3

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS — Exploit Prediction

0.0045

Probability of exploitation

0.38%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-22 Path Traversal

CWE-200 CWE-200

Affected Products

Vendor	Product	Versions
postcss	postcss	< 8.5.23

References

Advisories & Patches

https://github.com/postcss/postcss/commit/7beca139e70f9075c6b19700fcb00dd8033e5da8 https://github.com/postcss/postcss/security/advisories/GHSA-fxqj-rqcc-2cmp https://github.com/postcss/postcss/security/advisories/GHSA-fxqj-rqcc-2cmp

Exploits

https://github.com/postcss/postcss/security/advisories/GHSA-fxqj-rqcc-2cmp https://github.com/postcss/postcss/security/advisories/GHSA-fxqj-rqcc-2cmp

Other References

https://github.com/postcss/postcss/releases/tag/8.5.19

Frequently Asked Questions

What is 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. It has a CVSS v3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2026-69153? +

CVE-2026-69153 has a CVSS v3.1 score of 5.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0045, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-69153? +

CVE-2026-69153 affects products from postcss, specifically: postcss. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-69153? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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