Quick answers
- Is CVE-2026-63277 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-63277 being exploited in the wild.
- How severe is CVE-2026-63277?
- Informational severity, published 5 October 2026.
- Which products and versions are affected?
- LibreOffice Calc versions prior to 26.2.5 and 26.8.0.
- Is there a fix for CVE-2026-63277?
- Yes: fixed in LibreOffice 26.2.5, 26.8.0. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-63277 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-63277?
- Check whether you run LibreOffice Calc at an affected version. 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.
How to fix
- Fixed in: LibreOffice 26.2.5, 26.8.0
Technical details
LibreOffice Calc's external data-mapping feature via calcext:data-mappings with the SQL provider and JDBC connector allows loading Java database drivers from arbitrary URLs. When a document contains such a link, the Java driver is fetched and executed during document loading, requiring only that the user opens the document. The fix restricts Java class path entries to file URLs only.
Affected products
- LibreOffice Calc versions prior to 26.2.5 and 26.8.0
Timeline
- 2026-10-05: disclosed