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GHSA-6G55-P6WH-862Q PostCSS: Arbitrary file read and information disclosure via attacker-controlled sourceMappingURL in CSS comments

🗓️ 23 Jul 2026 15:06:16Reported by GoogleType 
osv
 osv🔗 osv.dev👁 166 Views

PostCSS can read local files from CSS sourceMappingURL, leaking bytes via a SyntaxError with untrusted CSS.

Related
Refs
ReporterTitlePublishedViews
Family
ibm
IBM Security Bulletins		Security Bulletin: IBM Maximo Application Suite - Cluster Performance Insights uses ansible_core-2.19.11, postcss-8.5.10 and dompurify-3.4.11 which are vulnerable to CVE-2026-16493, CVE-2026-45623, CVE-2026-69153 and CVE-2026-66010
28 Aug 202610:04
–ibm
ibm
IBM Security Bulletins		Security Bulletin: Multiple Vulnerabilities in IBM API Connect
8 Sep 202615:26
–ibm
ibm
IBM Security Bulletins		Security Bulletin: IBM Maximo Application Suite - Monitor Component uses postcss-8.4.38.tgz package which is vulnerable to CVE-2026-45623.
27 Aug 202619:34
–ibm
ibm
IBM Security Bulletins		Security Bulletin: There are vulnerabilities in IBM Maximo Manage application in IBM Maximo Application Suite
28 Aug 202605:57
–ibm
ibm
IBM Security Bulletins		Security Bulletin: IBM Maximo Application Suite uses postcss-8.5.10.tgz which is vulnerable to CVE-2026-45623
1 Sep 202613:54
–ibm
ibm
IBM Security Bulletins		Security Bulletin: Multiple Vulnerabilities affect IBM Decision Optimization for Cloud Pak for Data.
28 Sep 202608:43
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ibm
IBM Security Bulletins		Security Bulletin: Multiple vulnerabilities affect IBM Db2® on Cloud Pak for Data, and Db2 Warehouse on Cloud Pak for Data.
7 Sep 202611:00
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attackerkb
attackerkb		CVE-2026-45623
27 Jul 202617:23
–attackerkb
atlassian
Atlassian		Information Disclosure at postcss Dependency in Bamboo Data Center
27 Jul 202618:30
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atlassian
Atlassian		Information Disclosure postcss Dependency in Confluence Data Center
5 Aug 202616:31
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10 Sep 2026 03:51Current
5.4Medium risk
Vulners AI Score5.4
CVSS 3.17.5
EPSS0.00608
PostCSSarbitrary file readsourceMappingURLcssinformation disclosuresyntax erroruntrusted input
166