# CVE-2026-55050: Microsoft Office Word out-of-bounds read information disclosure

Source: https://junglewise.ai/threats/cve-2026-55050-microsoft-office-word-out-of-bounds-read-information-disclosure  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-14. Updated: 2026-07-14  
License: CC BY 4.0 with a link back

CVE-2026-55050 · Severity: medium · CVSS 5.5 · Published 2026-07-14

A security vulnerability has been identified in Microsoft Office Word and related SharePoint services that could allow an attacker to access sensitive information. To exploit this, an attacker would need to convince a user to open a specially crafted file on their computer. While this does not allow for direct control of the system, it could lead to the unauthorized disclosure of private data.

Technologies: [Microsoft 365 Apps for Enterprise](https://junglewise.ai/threats/technologies/365-apps-for-enterprise), [Microsoft Office 2019](https://junglewise.ai/threats/technologies/office-2019), [Microsoft Office 365 for Mac](https://junglewise.ai/threats/technologies/office-365-for-mac), [Microsoft Office LTSC 2021](https://junglewise.ai/threats/technologies/office-ltsc-2021), [Microsoft Office LTSC 2024](https://junglewise.ai/threats/technologies/office-ltsc-2024), [Microsoft Office LTSC for Mac 2021](https://junglewise.ai/threats/technologies/office-ltsc-for-mac-2021), [Microsoft Office LTSC for Mac 2024](https://junglewise.ai/threats/technologies/office-ltsc-for-mac-2024), [Microsoft SharePoint Enterprise Server 2016](https://junglewise.ai/threats/technologies/sharepoint-enterprise-server-2016), [Microsoft SharePoint Server 2019](https://junglewise.ai/threats/technologies/sharepoint-server-2019), [Microsoft SharePoint Server Subscription Edition](https://junglewise.ai/threats/technologies/sharepoint-server-subscription-edition). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-55050 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-55050 being exploited in the wild.

**How severe is CVE-2026-55050?** Medium severity, with a CVSS score of 5.5, published 14 July 2026.

**Which products and versions are affected?** Microsoft 365 Apps for Enterprise 16.0.1 and later versions prior to security updates; Microsoft Office 2019 19.0.0 and later versions prior to security updates; Microsoft Office 365 for Mac 1.0.0 to 16.111.26071215; Microsoft Office LTSC 2021 16.0.1 and later versions prior to security updates; and 6 more.

**Is there a fix for CVE-2026-55050?** A patch was published on 2026-07-14: Security updates made available via Microsoft Update Guide Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-55050 attacked?** It is attacked with local access, in a network appliance.

**Am I affected by CVE-2026-55050?** Check whether you run Microsoft 365 Apps for Enterprise, Microsoft Office 2019, Microsoft Office 365 for Mac or one of the others listed 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.

## Technical details

An out-of-bounds read vulnerability (CWE-125) exists in Microsoft Office Word and SharePoint Server components. The flaw is triggered when the application processes a specially crafted file, leading to memory disclosure. The attack vector is local, requiring user interaction (UI:R) to open a malicious document. Successful exploitation allows an unauthenticated attacker to read sensitive information from the process memory, though it does not provide a mechanism for code execution or data modification. Microsoft has released security updates to address this issue across affected Office and SharePoint versions.

## Affected products

- Microsoft Microsoft 365 Apps for Enterprise 16.0.1 and later versions prior to security updates
- Microsoft Microsoft Office 2019 19.0.0 and later versions prior to security updates
- Microsoft Microsoft Office 365 for Mac 1.0.0 to 16.111.26071215
- Microsoft Microsoft Office LTSC 2021 16.0.1 and later versions prior to security updates
- Microsoft Microsoft Office LTSC 2024 16.0.0 and later versions prior to security updates
- Microsoft Microsoft Office LTSC for Mac 2021 16.0.1 to 16.111.26071215
- Microsoft Microsoft Office LTSC for Mac 2024 16.0.0 to 16.111.26071215
- Microsoft Microsoft SharePoint Enterprise Server 2016 16.0.0 to 16.0.5561.1001
- Microsoft Microsoft SharePoint Server 2019 16.0.0 to 16.0.10417.20175
- Microsoft Microsoft SharePoint Server Subscription Edition 16.0.0 and later versions prior to security updates

## Timeline

- 2026-07-14: disclosed: Initial publication by Microsoft and NVD
- 2026-07-14: patched: Security updates made available via Microsoft Update Guide

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55050](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55050)

## Related threats

- [Out-of-bounds read in Microsoft Office Word allows an unauthorized attacker to disclose information locally.](https://junglewise.ai/threats/cve-2026-70310-out-of-bounds-read-in-microsoft-office-word-allows-an)
- [Microsoft SharePoint cross-site scripting vulnerability](https://junglewise.ai/threats/cve-2026-62826-microsoft-sharepoint-cross-site-scripting-vulnerability)
- [Microsoft SharePoint improper authorization privilege escalation](https://junglewise.ai/threats/cve-2026-58277-microsoft-sharepoint-improper-authorization-privilege-escalation)
- [Microsoft Office out-of-bounds read information disclosure](https://junglewise.ai/threats/cve-2026-56195-microsoft-office-out-of-bounds-read-information-disclosure)
- [Microsoft Office Out-of-bounds Read Information Disclosure](https://junglewise.ai/threats/cve-2026-56192-microsoft-office-out-of-bounds-read-information-disclosure)