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CVE-2026-63266

Arbitrary file write via calcext:data-mappings, sql provider and Firebird backup functionality

MEDIUM
6.8
CVSS Score
Published: October 5, 2026 at 11:17 AM UTC
Updated: October 6, 2026 at 03:03 PM UTC
1 product affected across 1 vendorLibreOffice

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Severity
MEDIUM6.8
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

LibreOffice· Document
60%
26.2 ≤ v < < 26.2.526.2

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

Source: cverecord
https://www.libreoffice.org/about-us/security/advisories/cve-2026-63266

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.8MEDIUMDocument Fdn.
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-22

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