# CVE-2026-55124: Microsoft Office Word information disclosure via improper input validation

Source: https://junglewise.ai/threats/cve-2026-55124-microsoft-office-word-information-disclosure-via-improper-input  
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-2026-55124 · Severity: medium · CVSS 5.5 · Published 2026-07-14

A vulnerability in Microsoft Office Word could allow an attacker to gain unauthorized access to sensitive information on a user's computer. To exploit this, an attacker would typically need to trick a user into opening a specially crafted file. This could lead to the exposure of private data, though it does not allow the attacker to modify files or take full control of the system directly.

Technologies: [Microsoft SharePoint Server](https://junglewise.ai/threats/technologies/sharepoint-server), [Microsoft Word](https://junglewise.ai/threats/technologies/word). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-55124 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-55124 being exploited in the wild.

**How severe is CVE-2026-55124?** Medium severity, with a CVSS score of 5.5, published 14 July 2026.

**Which products and versions are affected?** Microsoft Word Microsoft 365 Apps, Office 2019, Office LTSC 2021/2024, SharePoint Server.

**Is there a fix for CVE-2026-55124?** 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-2026-55124 attacked?** It is attacked with local access, in a network appliance.

**Am I affected by CVE-2026-55124?** Check whether you run Microsoft SharePoint Server or Microsoft Word 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 information disclosure vulnerability exists in Microsoft Office Word due to improper validation of specified input types (CWE-1287). The vulnerability is triggered when the application fails to correctly handle malformed data within a document. An attacker can exploit this by convincing a local user to open a malicious file, leading to the unauthorized disclosure of sensitive memory contents or local files. The attack requires user interaction (UI:R) and is executed with local vector (AV:L) privileges. Microsoft has released security updates to address this issue across affected versions of Office and SharePoint.

## Affected products

- Microsoft Office Word Microsoft 365 Apps, Office 2019, Office LTSC 2021/2024, SharePoint Server

## Timeline

- 2026-07-14: disclosed
- 2026-07-14: advisory

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55124](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55124)

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