CVE-2026-63266

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{"bugzilla": {"description": "libreoffice: LibreOffice: Arbitrary file write via embedded Firebird database links", "id": "2545891", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2545891"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N", "status": "draft"}, "cwe": "CWE-22", "details": ["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."], "mitigation": {"lang": "en:us", "value": "As a temporary workaround, restrict access to or disable automatic update of linked external data sources in LibreOffice Calc preferences, or block opening untrusted files containing embedded Firebird database connections."}, "name": "CVE-2026-63266", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Fix deferred", "package_name": "libreoffice", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "libreoffice", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "libreoffice", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "libreoffice", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-10-05T11:17:21Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-63266\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-63266\nhttps://www.libreoffice.org/about-us/security/advisories/cve-2026-63266"], "statement": "LibreOffice Calc allows cell ranges to link to external data sources, which are stored within the document structure. A spreadsheet containing a crafted link can trigger LibreOffice Calc to automatically load an embedded Firebird database, which fails to properly restrict path access. Consequently, an attacker can leverage a specially crafted spreadsheet to write or overwrite arbitrary files on the local filesystem with the permissions of the user opening the document.", "threat_severity": "Moderate"}

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