LibreOffice 26.2<26.2.5 URL EnvVar Expansion Exfil
CVE-2026-63278 Published on September 22, 2026
Package URLs can be used to exfiltrate arbitrary INI file values and environment variables
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 recognise every way of naming the package content provider, so a URL that named it differently still reached the expansion. In fixed versions the package content provider is matched when the URL is checked.
Vulnerability Analysis
CVE-2026-63278 is exploitable with local system access. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity and availability.
Weakness Type
What is an Information Disclosure Vulnerability?
The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.
CVE-2026-63278 has been classified to as an Information Disclosure vulnerability or weakness.
Products Associated with CVE-2026-63278
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Affected Versions
The Document Foundation LibreOffice:- Version 26.2 and below < 26.2.5 is affected.