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CVE-2026-63277— RCE via calcext:data-mappings, sql provider and jdbc connector

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 可以将单元格范围链接到外部数据源，并且该链接会保存在文档中。文档可以为这样的链接指定一个 Java 数据库驱动程序，从而允许从远程位置加载该驱动程序，因此在打开文档时可能会执行来自该位置的 Java 代码。在修复版本中，Java 类路径中的条目必须是文件 URL。

CVSS 8.5 · High
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I. Basic Information for CVE-2026-63277

Vulnerability Information
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Vulnerability Title
RCE via calcext:data-mappings, sql provider and jdbc connector
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. A document could name a Java database driver for such a link to be loaded from a remote location, so opening the document could run Java code from that location. In fixed versions an entry in a Java class path has to be a file URL.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
从非可信控制范围包含功能例程
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-2026-63277

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III. Intelligence Information for CVE-2026-63277

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Other References for CVE-2026-63277 (1)

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

CVE-2026-63266 6.8 MEDIUM Arbitrary file write via calcext:data-mappings, sql provider and Firebird backup functiona
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-829

V. Comments for CVE-2026-63277

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