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HighMalwareOct 6, 2026

LibreOffice and OpenOffice Flaw Allows Code Execution via Spreadsheets

Security researchers have identified a vulnerability in LibreOffice and Apache OpenOffice that allows specially crafted spreadsheets to run attacker code immediately upon opening. The exploit executes without displaying customary macro security warnings, provided the application has Java support enabled. Although currently limited to a proof of concept, an attacker could weaponise these files to compromise workplace computers.

Malware security briefing

Who is affected

Organisations and employees using LibreOffice or Apache OpenOffice with Java support turned on.

How to mitigate it

  1. 1Disable Java support within LibreOffice and OpenOffice application settings across all workstations where it is not essential.
  2. 2Apply the latest software patches from LibreOffice and Apache OpenOffice as soon as official fixes are released.
  3. 3Advise staff to exercise caution and avoid opening unsolicited spreadsheet attachments from external senders.

How Outsource IT solves this

Our endpoint management service ensures third-party applications are promptly patched and securely configured across your entire device fleet to block hidden exploits.

Endpoint Management & User Support

Tags

LibreOfficeOpenOfficeEndpoint SecurityVulnerability

Source advisory: the-hacker-news

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