---
id: CVE-2026-63270
title: >-
  URLs could be constructed which expanded environment variable or INI file
  values, so potentially sensitive information could be exfiltrated to a remote
  server on opening a document containing such links
summary: >-
  URLs could be constructed which expanded environment variable or INI file
  values, so potentially sensitive information could be exfiltrated to a remote
  server on opening a document containing such links. The check added for
  CVE-2024-1242…
severity: medium
cvss: 6.7
cvssVector: 'CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:P/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N'
cwe:
  - CWE-200
vendor: The Document Foundation
product: LibreOffice
affected:
  - LibreOffice >= 26.2 < < 26.2.5
published: '2026-10-05'
updated: '2026-10-05'
sourceUpdated: '2026-10-05T13:16:54.040'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-63270'
references:
  - url: 'https://www.libreoffice.org/about-us/security/advisories/cve-2026-63270'
    label: security@documentfoundation.org
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-05T12:40:06.243261Z'
cvssSource: cna
ingestedAt: '2026-10-05T12:19:22.672Z'
---

## Overview

URLs could be constructed which expanded environment variable or INI file values, so potentially sensitive information could be exfiltrated to a remote server on opening a document containing such links. The check added for CVE-2024-12426 did not cover every place a document can supply a URL. XForms instance data and the Calc csv and sql data providers still reached the expansion. In fixed versions these places refuse URLs with internal schemes when the URL comes from the document.

## Remediation

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