Bug 2537957 (CVE-2026-63278)

Summary: CVE-2026-63278 libreoffice: LibreOffice: Information disclosure via crafted URLs expanding environment variables
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in LibreOffice. A remote attacker could craft a malicious document containing specially constructed URLs. When a user opens this document, these URLs could expand environment variables or INI file values, leading to the exfiltration of potentially sensitive information to a remote server. This vulnerability allows for unauthorized disclosure of local system configuration or user-specific data.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-09-22 16:21:30 UTC 
URLs could be constructed which expanded environment variable or INI file values, so potentially sensitive information could be exfiltrated to a remote server on opening a document containing such links. The check added for CVE-2024-12426 did not recognise every way of naming the package content provider, so a URL that named it differently still reached the expansion. In fixed versions the package content provider is matched when the URL is checked.