CVE-2026-63270 Environment/ini-file leaks
Attackers can exfiltrate sensitive environment or INI file data by tricking users into opening documents with crafted URLs in LibreOffice.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-63270?
CVE-2026-63270 is a medium-severity vulnerability in The Document Foundation LibreOffice, published on 5 Oct 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
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.
Weakness: CWE-200
Which versions are affected by CVE-2026-63270?
How do I fix CVE-2026-63270?
Apply the vendor's patch.
Is CVE-2026-63270 being exploited?
There is no known exploitation of CVE-2026-63270 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-63270, DEBIAN-CVE-2026-63270, ECHO-a3c2-1cf9-5993, GHSA-p537-j8hg-x628, MINI-qxj8-g55x-p86c, UBUNTU-CVE-2026-63270.