---
title: "CVE-2026-21514: Microsoft Word Security Feature Bypass… | CubePath"
description: "Reliance on untrusted inputs in a security decision in Microsoft Office Word allows an unauthorized attacker to bypass a security feature locally."
language: en
source: https://cubepath.com/security/cve/CVE-2026-21514
---

# CVE-2026-21514: Microsoft Word Security Feature Bypass… | CubePath

## Description

Reliance on untrusted inputs in a security decision in Microsoft Office Word allows an unauthorized attacker to bypass a security feature locally.

Official description from the CVE record, published by microsoft. Copyright © 1999-2026 The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CVE license. [View the record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-21514)

## Key data

### CVSS 3.1 High 7.8

Score published by microsoft in the CVE record.

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C

| Metric                 | Value     | What it means                                                                             |
| ---------------------- | --------- | ----------------------------------------------------------------------------------------- |
| Attack vector          | Local     | The attacker needs local access to the system, or to trick a user into running something. |
| Attack complexity      | Low       | No special conditions are needed. The attack can be repeated at will.                     |
| Privileges required    | None      | No account or privileges are needed.                                                      |
| User interaction       | Required  | A user has to do something first, such as opening a file or following a link.             |
| Scope                  | Unchanged | The impact stays within the vulnerable component.                                         |
| Confidentiality impact | High      | Serious or total effect on the secrecy of data.                                           |
| Integrity impact       | High      | Serious or total effect on the trustworthiness of data.                                   |
| Availability impact    | High      | Serious or total effect on availability.                                                  |

CVSS is owned and managed by FIRST.Org, Inc. (FIRST) and is used by permission. Each CVSS score on this site is shown together with its vector string, as published in the CVE record by the source named next to it. Learn more at [first.org/cvss](https://www.first.org/cvss/) .

### EPSS

Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days.

Score

0.01587 (1.6% probability)

Percentile

75.8%

Scores of

Nov 10, 2026

Model

v2026.06.15

### CISA Known Exploited Vulnerabilities

This CVE is listed in the CISA KEV catalog.

Name in the catalog

Microsoft Office Word Reliance on Untrusted Inputs in a Security Decision Vulnerability

Added to the catalog

Feb 10, 2026

Federal due date

Mar 3, 2026

### CISA assessment as of Feb 11, 2026

Stakeholder-Specific Vulnerability Categorization (SSVC) decision points added by CISA.

Exploitation

Recorded by CISA as active

Automatable

no

Technical impact

total

### Weakness (CWE)

CWE catalog version 5.0.

CWE names: Copyright © 2006-2026, The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CWE license.

- [CWE-807](https://cwe.mitre.org/data/definitions/807.html) Reliance on Untrusted Inputs in a Security Decision

## Affected products

Products listed in the CVE record, as the CNA published them.

- Microsoft 365 Apps for Enterprise

  - affected: 16.0.1 up to before https://aka.ms/OfficeSecurityReleases
- Microsoft Office LTSC 2021

  - affected: 16.0.1 up to before https://aka.ms/OfficeSecurityReleases
- Microsoft Office LTSC 2024

  - affected: 16.0.0 up to before https://aka.ms/OfficeSecurityReleases
- Microsoft Office LTSC for Mac 2021

  - affected: 16.0.1 up to before 16.106.26020821
- Microsoft Office LTSC for Mac 2024

  - affected: 16.0.0 up to before 16.106.26020821

## References

Links listed in the CVE record. They lead to other sites, which CubePath does not control.

- [Microsoft Word Security Feature Bypass Vulnerability](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21514)  (msrc.microsoft.com) vendor-advisory patch

## Timeline

1. ID reserved Dec 30, 2025
2. Added to CISA KEV Feb 10, 2026
3. Record published Feb 10, 2026
4. Record last updated Aug 19, 2026

## Look up another CVE

## About CubePath

CubePath is a cloud provider with data centers in Europe and the United States. It offers VPS, bare metal servers and DDoS protection.

[Cloud VPS](https://cubepath.com/vps) [DDoS protection](https://cubepath.com/ddos-protection)

Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 20:05 UTC. [Sources and licenses](https://cubepath.com/security/cve/legal)