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CVE-2026-63266— Arbitrary file write via calcext:data-mappings, sql provider and Firebird backup functionality

Quick assessment

Affected
The Document Foundation LibreOffice
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

LibreOffice Calc 允许将单元格区域链接到外部数据源，且该链接会被保存在文档中。通过此类链接，文档可以打开一个嵌入式的 Firebird 数据库，并在用户具有写入权限的任何位置创建文件。在已修复的版本中，嵌入式 Firebird 数据库仅能在其私有目录内打开或创建文件。

CVSS 6.8 · Medium

Possible ATT&CK Techniques 1 AI

T1566.001 · Spearphishing Attachment
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I. Basic Information for CVE-2026-63266

Vulnerability Information
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Vulnerability Title
Arbitrary file write via calcext:data-mappings, sql provider and Firebird backup functionality
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
The Document Foundation LibreOffice 26.2 ~ < 26.2.5 -

II. Public POCs for CVE-2026-63266

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III. Intelligence Information for CVE-2026-63266

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Other References for CVE-2026-63266 (1)

Same Patch Batch · The Document Foundation · 2026-10-05 · 6 CVEs total

CVE-2026-63277 8.5 HIGH RCE via calcext:data-mappings, sql provider and jdbc connector
CVE-2026-63270 6.7 MEDIUM Environment/ini-file leaks
CVE-2026-63269 6.7 MEDIUM LFI and GET SSRF via GStreamer and HLS playlists
CVE-2026-63267 6.7 MEDIUM LFI and GET SSRF via calcext:data-mappings and csv provider
CVE-2026-63268 6.7 MEDIUM LFI via calcext:data-mappings, sql provider and sdbc:flat:file:// db href

IV. Related Vulnerabilities

Same product: LibreOffice
Same vendor: The Document Foundation
Same weakness: CWE-22

V. Comments for CVE-2026-63266

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