CVE-2019-9855: Document Foundation LibreOffice vulnerability |…

CVE-2019-9855: Windows 8.3 path equivalence handling flaw allows LibreLogo script execution

LibreOffice is typically bundled with LibreLogo, a programmable turtle vector graphics script, which can execute arbitrary python commands contained with the document it is launched from. LibreOffice also has a feature where documents can specify that pre-installed scripts can be executed on various document script events such as mouse-over, etc. Protection was added to block calling LibreLogo from script event handers. However a Windows 8.3 path equivalence handling flaw left LibreOffice vulnerable under Windows that a document could trigger executing LibreLogo via a Windows filename pseudonym. This issue affects: Document Foundation LibreOffice 6.2 versions prior to 6.2.7; 6.3 versions prior to 6.3.1.

UnknownCVSS not scoredNot KEV-listedUpdatedSep 16, 2024, 18:49 UTC (UTC+00:00)

Security readout for executives and security teams

A malicious LibreOffice document on Windows could bypass LibreOffice's protection against LibreLogo event handlers by using Windows 8.3 filename equivalence. If opened in affected versions, the document could trigger LibreLogo and run embedded Python commands. This is mainly a legacy desktop-software risk. Exposure is limited to Windows systems running affected LibreOffice 6.2 or 6.3 builds, especially where users open untrusted office documents. Current supported LibreOffice deployments are unlikely to be exposed if upgraded beyond the fixed versions. Treat this as a targeted legacy remediation item. It does not indicate broad current emergency exposure, but affected Windows desktops handling external documents should be upgraded promptly because successful exploitation can execute code through document content. Mitigation focus: Upgrade LibreOffice 6.2 to 6.2.7 or later.; Upgrade LibreOffice 6.3 to 6.3.1 or later.; Prioritize Windows endpoints that process untrusted documents..

Prepared: Jun 6, 2026, 13:29 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Sep 6, 2019, 18:40 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

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0CVSS vectors

0Timeline events

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2Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

CVE List V5 sourceCVE List V5
https://www.libreoffice.org/about-us/security/advisories/CVE-2019-9855/CVE reference · x_refsource_CONFIRM

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

Document FoundationLibreOffice6.2, 6.3Listed

Weakness

CWE details

No CWE listed

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