CVE-2025-64403 Apache OpenOffice: Remote documents loaded without prompt via "external data sources" in Calc
Attackers can craft documents that load external data sources without user prompts, bypassing security checks in Apache OpenOffice Calc.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2025-64403?
CVE-2025-64403 is a high-severity missing authorization vulnerability in Apache Openoffice, published on 12 Nov 2025. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
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.
Weakness: CWE-862
Which versions are affected by CVE-2025-64403?
It affects 1 product.
Products include Apache Openoffice.
How do I fix CVE-2025-64403?
No fix has been published for CVE-2025-64403 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2025-64403 being exploited?
There is no known exploitation of CVE-2025-64403 in the wild and no public exploit code.
Other vulnerabilities in Apache Openoffice
Sources
Also known as GHSA-3r8r-ch94-c42m.