CVE-2026-63267
Description
A flaw was found in LibreOffice. When loading a spreadsheet, external comma-separated values (CSV) data links were automatically fetched without applying standard link update controls. A remote attacker could exploit this vulnerability by enticing a user to open a specially crafted document, causing the application to read local files into the sheet or initiate outbound network requests, resulting in information disclosure.
Statement
LibreOffice Calc automatically fetches external CSV data links during document load without enforcing standard link update control policies. By convincing a user to open a specially crafted spreadsheet, an attacker can leverage these automatic external queries to read arbitrary local files into spreadsheet cells or trigger unauthorized outbound network requests. This allows a local or remote adversary to exfiltrate sensitive local data or conduct internal network probing under the security context of the user opening the file.
Mitigation
To mitigate this issue, configure LibreOffice Calc security options to disable or prompt for automatic updating of external links when opening documents from untrusted sources.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 5.5 | N/A | N/A |
| Attack Vector | Local | N/A | N/A |
| Attack Complexity | Low | N/A | N/A |
| Privileges Required | None | N/A | N/A |
| User Interaction | Required | N/A | N/A |
| Scope | Unchanged | N/A | N/A |
| Confidentiality | High | N/A | N/A |
| Integrity Impact | None | N/A | N/A |
| Availability Impact | None | N/A | N/A |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
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