---
id: CVE-2026-63266
title: >-
  LibreOffice Calc can link a cell range to an external data source, and the
  link is saved in the document
summary: >-
  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. …
severity: medium
cvss: 6.8
cvssVector: 'CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N'
cwe:
  - CWE-22
vendor: The Document Foundation
product: LibreOffice
affected:
  - LibreOffice >= 26.2 < < 26.2.5
published: '2026-10-05'
updated: '2026-10-06'
sourceUpdated: '2026-10-06T15:03:59.427'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-63266'
references:
  - url: 'https://www.libreoffice.org/about-us/security/advisories/cve-2026-63266'
    label: security@documentfoundation.org
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-63266.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-63266'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2545891'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-63266'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-63266'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-05T12:42:40.333248Z'
cvssSource: cna
scores:
  cna: 6.8
  vendor: 5.5
ingestedAt: '2026-10-05T12:19:22.671Z'
epss: 0.00156
epssPercentile: 0.0466
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · updated 2026-10-05 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-63266.json)