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.
Metrics
Affected Vendors & Products
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History
Tue, 04 Aug 2026 00:15:00 +0000
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threat_severity
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cvssV3_1
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Mon, 03 Aug 2026 19:30:00 +0000
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ssvc
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Mon, 03 Aug 2026 19:15:00 +0000
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Postcss
Postcss postcss |
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Postcss
Postcss postcss |
Mon, 03 Aug 2026 17:15:00 +0000
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| 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. | |
| Title | PostCSS: incomplete fix of CVE-2026-45623 — attacker-controlled sourceMappingURL reads arbitrary .map files when `from` is unset | |
| Weaknesses | CWE-200 CWE-22 |
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cvssV4_0
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Status: PUBLISHED
Assigner: GitHub_M
Published: 2026-08-03T16:56:25.733Z
Updated: 2026-08-03T18:28:59.737Z
Reserved: 2026-08-03T15:47:09.654Z
Link: CVE-2026-69153
Updated: 2026-08-03T18:28:52.676Z
No data.