PostCSS: incomplete fix of CVE-2026-45623 — attacker-controlled sourceMappingURL reads arbitrary .map files when `from` is unset
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
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| postcss | postcss | affected |
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No data.
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| Postcss | Postcss |
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| Source | ID | Title |
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Github GHSA |
GHSA-fxqj-rqcc-2cmp | PostCSS: incomplete fix of GHSA-6g55-p6wh-862q — attacker-controlled sourceMappingURL reads arbitrary .map files when `from` is unset |
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.451% probability within 30 days)
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threat_severity
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cvssV3_1
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ssvc
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| First Time appeared |
Postcss
Postcss postcss |
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Postcss
Postcss postcss |
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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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