# CVE-2026-111291: Microsoft Office out-of-bounds read information disclosure

Source: https://junglewise.ai/threats/cve-2026-111291-out-of-bounds-read-in-microsoft-office-allows-an-unauthorized  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-10. Updated: 2026-11-10  
License: CC BY 4.0 with a link back

CVE-2026-111291 · Severity: medium · CVSS 6.5 · Published 2026-11-10

Microsoft Office contains an out-of-bounds read vulnerability that allows an attacker to disclose sensitive information by sending a specially crafted document over the network. An attacker can exploit this without authentication to extract data from the affected system, potentially exposing confidential documents or user information.

Technologies: [Microsoft Office](https://junglewise.ai/threats/technologies/office). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-111291 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-111291 being exploited in the wild.

**How severe is CVE-2026-111291?** Medium severity, with a CVSS score of 6.5, published 10 November 2026.

**Which products and versions are affected?** Microsoft Office.

**Is there a fix for CVE-2026-111291?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-111291 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-111291?** Check whether you run Microsoft Office. 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.

## Technical details

An out-of-bounds read vulnerability in Microsoft Office allows an attacker to read memory outside allocated bounds when processing a specially crafted document. The vulnerability is reachable over the network without prior authentication, enabling information disclosure. No public exploit is known at the time of disclosure.

## Affected products

- Microsoft Office

## Timeline

- 2026-11-10: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-111291](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-111291)

## Related threats

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- [Microsoft Office heap-based buffer overflow](https://junglewise.ai/threats/cve-2026-122198-heap-based-buffer-overflow-in-microsoft-office-allows-an)
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- [Microsoft Office UI security feature bypass](https://junglewise.ai/threats/cve-2026-119998-product-ui-does-not-warn-user-of-unsafe-actions-in-microsoft)
- [Microsoft Office heap-based buffer overflow](https://junglewise.ai/threats/cve-2026-116717-heap-based-buffer-overflow-in-microsoft-office-allows-an)