CVE-2026-63266

unknown

Published 2026-10-05 · Modified 2026-10-05

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CVSS v3

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CVSS v4 NEW

6.8

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

VIR risk

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Description

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.

Predictions

Exploit likelihood

20%

Patch ETA

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Heuristic predictions, AS-IS, for prioritization only.

Mitigations

Mitigation details

Source: Debian Security Tracker · View original ↗ · DFSG

CVE-2026-63266 NameCVE-2026-63266 DescriptionArbitrary file write via calcext:data-mappings, sql provider and Firebird backup functionality SourceCVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) Vulnerable and fixed packages The table below lists information on source packages. Source…

CVE-2026-63266

Name	CVE-2026-63266
Description	Arbitrary file write via calcext:data-mappings, sql provider and Firebird backup functionality
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
libreoffice (PTS)	bookworm	4:7.4.7-1+deb12u14	vulnerable
	bookworm (security)	4:7.4.7-1+deb12u13	vulnerable
	trixie	4:25.2.3-2+deb13u6	vulnerable
	trixie (security)	4:25.2.3-2+deb13u7	vulnerable
	forky	4:26.8.0.3-2	fixed
	sid	4:26.8.1.1-2	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
libreoffice	source	(unstable)	4:26.2.5.2-1

Notes

https://www.libreoffice.org/security/#cve-2026-63266

Home - Debian Security - Source (Git)

Apply commands

text fix

Notes

https://www.libreoffice.org/security/#cve-2026-63266

OS impact

Debian Mixed 4 releases

Version	Status	Fixed in
trixie	Affected	—
sid	Fixed	`4:26.2.5.2-1`
forky	Fixed	`4:26.2.5.2-1`
bookworm	Affected	—

References

CWEs

CWE-22

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.