CVE-2026-63267
Received Received - Intake

LibreOffice Calc External CSV Link Arbitrary File Read

Publication date: 2026-10-05

Last updated on: 2026-10-05

Assigner: Document Foundation, The

Description
LibreOffice Calc can link a cell range to an external csv data source, and the link is saved in the document. Such a link was fetched while the document loaded, so opening a document could read a local file into the sheet, or make a request to a host of the document's choosing. In fixed versions external data links are updated under the same link update control as other links in a spreadsheet.

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Meta Information

Published
2026-10-05
Last Modified
2026-10-05
Generated
2026-10-05
AI Q&A
2026-10-05
EPSS Evaluated
N/A
NVD
CVE-2026-63267
EUVD
EUVD-2026-92418

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
The Document Foundation LibreOffice 26.2

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-918 The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.
CWE-200 The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.

Attack-Flow Graph

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Executive Summary

LibreOffice Calc allows linking a cell range to an external CSV data source, which is saved in the document. When opening the document, the link fetches data automatically, potentially reading local files into the sheet or making requests to arbitrary hosts. Fixed versions require explicit link updates like other spreadsheet links.

Detection Guidance

To detect this vulnerability, inspect LibreOffice Calc documents for external CSV data links. Check for unexpected network requests or file reads during document loading. Review document properties for suspicious linked resources.

Impact Analysis

This vulnerability could allow an attacker to trick a user into opening a malicious document that reads sensitive local files into the spreadsheet or makes unauthorized network requests. This may lead to data leakage or further exploitation of the user's system.

Compliance Impact

This vulnerability could lead to unauthorized access or exposure of sensitive data, violating GDPR's data protection principles or HIPAA's confidentiality requirements. Organizations may face compliance breaches if such data exposure occurs due to this flaw.

Mitigation Strategies

Update LibreOffice to a fixed version where external data links are controlled during document loading. Avoid opening untrusted documents that may contain malicious external links.

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