# CVE-2025-64403: Apache OpenOffice Calc spreadsheet can contain links to other files, in the form of "external data sources". A missing…

Source: https://junglewise.ai/threats/cve-2025-64403-apache-openoffice-calc-spreadsheet-can-contain-links-to-other  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2025-11-12  
License: CC BY 4.0 with a link back

CVE-2025-64403 · Severity: high · CVSS 8.1 · Published 2025-11-12

Apache OpenOffice Calc spreadsheet can contain links to other files, in the form of "external data sources". A missing Authorization vulnerability in Apache OpenOffice allowed an attacker to craft a document that would cause such links 
to be loaded without prompt.

This issue affects Apache OpenOffice: through 4.1.15.

Users are recommended to upgrade to version 4.1.16, which fixes the issue.

Technologies: [Apache OpenOffice](https://junglewise.ai/threats/technologies/openoffice). Vendors: [Apache](https://junglewise.ai/threats/vendors/apache).

## Quick answers

**Is CVE-2025-64403 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2025-64403 being exploited in the wild.

**How severe is CVE-2025-64403?** High severity, with a CVSS score of 8.1, published 12 November 2025.

**Which products and versions are affected?** Apache OpenOffice. The advisory does not name versions.

**Is there a fix for CVE-2025-64403?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**Am I affected by CVE-2025-64403?** Check whether you run Apache OpenOffice. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- Apache OpenOffice

## Related threats

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- [Apache OpenOffice out-of-bounds memory write in PDF import](https://junglewise.ai/threats/cve-2026-90634-an-uncontrolled-memory-access-in-the-pdf-import-code-of-apache)
- [Apache OpenOffice file disclosure via GStreamer multimedia handling](https://junglewise.ai/threats/cve-2026-90632-apache-openoffice-documents-can-include-multimedia-content-audio)
- [Apache OpenOffice external link loading without authorization](https://junglewise.ai/threats/cve-2026-90631-apache-openoffice-documents-can-contain-links-a-missing)
- [Apache OpenOffice memory access violation in WMF import](https://junglewise.ai/threats/cve-2026-90629-an-uncontrolled-memory-access-in-the-wmf-import-code-of-apache)