Is CVE-2026-63267 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-63267 being exploited in the wild.

How severe is CVE-2026-63267?

Informational severity, published 5 October 2026.

Which products and versions are affected?

LibreOffice Calc before 26.2.5 or 26.8.0.

How is CVE-2026-63267 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-63267?

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.

CVE-2026-63267: LibreOffice Calc external CSV data link LFI and SSRF

CVE-2026-63267 · Severity: info · Published 2026-10-05

LibreOffice Calc allows spreadsheets to link to external CSV data sources, with these links automatically fetched when a document is opened. An attacker can craft a malicious spreadsheet that reads local files or makes arbitrary network requests to attacker-controlled servers when the document is opened by a user. This could lead to exposure of sensitive local files or use the victim's computer as a proxy for network attacks.

Technologies: LibreOffice Calc. Vendors: LibreOffice.

Quick answers

Is CVE-2026-63267 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-63267 being exploited in the wild.
How severe is CVE-2026-63267?: Informational severity, published 5 October 2026.
Which products and versions are affected?: LibreOffice Calc before 26.2.5 or 26.8.0.
Is there a fix for CVE-2026-63267?: Yes: fixed in LibreOffice 26.2.5, 26.8.0. Until then: Disable or restrict automatic external link updates in LibreOffice Calc settings until upgrading, and avoid opening spreadsheet documents from untrusted sources. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-63267 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-63267?: 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

Disable or restrict automatic external link updates in LibreOffice Calc settings until upgrading, and avoid opening spreadsheet documents from untrusted sources.

Technical details

LibreOffice Calc's external data linking feature via calcext:data-mappings and CSV provider automatically fetches links during document load without proper access controls. An attacker can embed a link pointing to local file:// URLs or remote HTTP(S) destinations in a spreadsheet; opening the malicious document triggers LFI (local file inclusion) or GET-based SSRF attacks. In fixed versions, external data links are subject to the same link update control as other spreadsheet links, requiring user confirmation before fetching external resources.

Affected products

LibreOffice Calc before 26.2.5 or 26.8.0

Timeline

2026-10-05: disclosed
2026-10-05: patched

References

https://www.libreoffice.org/about-us/security/advisories/cve-2026-63267

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