LibreOffice and Apache OpenOffice Flaws Enable Remote Code Execution via Malicious Spreadsheets Without Macro Warnings
Two vulnerabilities allow attackers to execute arbitrary code simply by opening manipulated office documents, bypassing the usual macro security warnings. The flaws affect LibreOffice Calc and Apache OpenOffice through their integration with Java and the way these applications resolve certain components when loading untrusted files.
CVE-2026-63277 impacts LibreOffice and permits a crafted spreadsheet to trigger loading of a Java database driver from a remote location. The root cause lies in class path handling: an attacker-controlled entry can point outside the local system, causing the application to fetch and execute classes from an external source. The fix enforces that every class path entry must be a file-type URL, effectively blocking remote class loading.
Users should update LibreOffice to version 26.2.5 or 26.8.0 or later. These releases also harden handling of external data links and JDBC connectors in Calc, reducing exposure in environments that regularly exchange spreadsheets containing database connections.
CVE-2026-59265 affects Apache OpenOffice 4.1.16 and earlier, enabling local or remote code execution when a malicious document abuses the Java integration. A stable patch is planned for 4.1.17, currently available only as a release candidate. Until then, administrators should disable Java support in OpenOffice wherever it is not strictly required.
Additional defensive steps include limiting Java usage across office suites on endpoints that frequently open attachments, enforcing strict policies against opening files from untrusted origins, and applying application isolation where feasible. Running office applications with the lowest possible privileges further contains any successful exploitation to the user’s permission boundary.
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