--- title: "CVE-2026-63277: LibreOffice Calc - Remote Code Execution" description: "LibreOffice Calc contains a remote code execution vulnerability caused by loading a Java database driver from a remote location via external data source links, letting attackers execute Java code remotely, exploit requires opening a crafted document." url: https://panop.io/threat-heartbeat/CVE-2026-63277/ --- # CVE-2026-63277 LibreOffice Calc - Remote Code Execution LibreOffice Calc contains a remote code execution vulnerability caused by loading a Java database driver from a remote location via external data source links, letting attackers execute Java code remotely, exploit requires opening a crafted document. CVSS base score 8.5 /10 High CISA KEV Not listed Public exploit Proof of concept available Authentication Not required EPSS 0.15% chance of exploitation in 30 days [View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-63277) ## Details Type Remote Code Execution Impact Remote Code Execution CVSS vector CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Published 5 October 2026 Updated 15 October 2026 Weakness [CWE-829](https://cwe.mitre.org/data/definitions/829.html) ## Vendor fix Update to the fixed versions where Java class path entries must be file URLs or upgrade to the latest version. Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them. ## References - [https://nvd.nist.gov/vuln/detail/CVE-2026-63277](https://nvd.nist.gov/vuln/detail/CVE-2026-63277) - [https://www.libreoffice.org/about-us/security/advisories/cve-2026-63277](https://www.libreoffice.org/about-us/security/advisories/cve-2026-63277) [← All CVEs](https://panop.io/threat-heartbeat/) ## What this record can't tell you - Whether you run the affected software, and where - Whether an attacker can actually reach and exploit it - The misconfigurations that never get a CVE number - What it would cost the business, ranked into what to fix first Panop answers these inside your environment, for this CVE and every other finding. [Book a demo](https://panop.io/demo)