PostCSS Vulnerability Exposes Source-Map Files
CVE-2026-69153

6.3MEDIUM

Key Information:

Vendor

Postcss

Status
Postcss
Vendor
CVE Published:
3 August 2026

What is CVE-2026-69153?

The vulnerability in PostCSS allows attackers to exploit a flaw in handling the sourceMappingURL when 'from' is unset, leading to the potential exposure of unintended source-map files. This may reveal sensitive information within the application's sources and sourcesContent. The issue was resolved in version 8.5.19, emphasizing the importance of timely updates for maintaining security.

Affected Version(s)

postcss < 8.5.19

References

https://github.com/postcss/postcss/security/advisories/GH...
x_refsource_CONFIRM
https://github.com/postcss/postcss/commit/7beca139e70f907...
x_refsource_MISC
https://github.com/postcss/postcss/releases/tag/8.5.19
x_refsource_MISC

CVSS V4

Score:
6.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.