Bug 2545891 (CVE-2026-63266)

Summary: CVE-2026-63266 libreoffice: LibreOffice: Arbitrary file write via embedded Firebird database links
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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. When processing a spreadsheet with a cell range linked to an external data source, LibreOffice Calc can load an embedded Firebird database that writes files outside its intended directory. By convincing a user to open a specially crafted document, an attacker could create or overwrite arbitrary files with the permissions of the victim.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Description OSIDB Bzimport 2026-10-05 11:40:13 UTC
LibreOffice Calc can link a cell range to an external data source, and the link is saved in the document. Through such a link a document could open an embedded Firebird database that wrote a file to any location the user could write to. In fixed versions an embedded Firebird database can open or create files only inside its own private directory.