Description
Reliance on untrusted inputs in a security decision in Microsoft Office Word allows an unauthorized attacker to bypass a security feature locally.
Published: 2026-02-10
Score: 7.8 High
EPSS: 4.2% Low
KEV: Yes
Impact: Local Security Feature Bypass
Action: Apply Patch
AI Analysis

Impact

The CVE entry describes a flaw in Microsoft Word that arises when the application processes untrusted input in a security decision. The vulnerability allows an attacker with local access to bypass a built‑in security feature, potentially enabling the execution of code or content that would normally be blocked. This corresponds to a broken access control weakness identified as CWE-807.

Affected Systems

Affected releases include Microsoft 365 Apps for Enterprise, Office LTSC 2021, Office LTSC 2024, and the macOS versions of Office LTSC 2021 and 2024. The vendor information does not list explicit version ranges, so any installation of these suites is considered vulnerable until a fix is applied.

Risk and Exploitability

The impact carries a CVSS score of 7.8, which indicates high severity. The EPSS score of 4 % suggests that exploitation is occurring at a low but non‑negligible rate. The vulnerability is present in CISA's Known Exploited Vulnerabilities catalog, confirming that attackers have leveraged it. Because the flaw is local, an attacker must already have some degree of local access; no remote exploitation path is disclosed. The likely attack vector is a classic local bypass scenario where the attacker can exploit the vulnerability from within the system.

Generated by OpenCVE AI on April 15, 2026 at 17:25 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Update Microsoft 365 Apps, Office LTSC 2021, Office LTSC 2024, and Office LTSC for Mac to the latest cumulative update that addresses CVE-2026-21514 as documented in the Microsoft Security Response Center
  • Apply any related Office security update rollups published after the vulnerability disclosure
  • If a timely patch is not yet available, isolate affected machines, disable macros, and enforce stricter document access controls to mitigate the local bypass until a fix is applied

Generated by OpenCVE AI on April 15, 2026 at 17:25 UTC.

Tracking

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Advisories

No advisories yet.

History

Wed, 11 Feb 2026 16:00:00 +0000

Type Values Removed Values Added
First Time appeared Microsoft office Long Term Servicing Channel
CPEs cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x64:*
cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x86:*
cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:-:x64:*
cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:-:x86:*
cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:macos:*:*
cpe:2.3:a:microsoft:office_long_term_servicing_channel:2024:*:*:*:*:-:x64:*
cpe:2.3:a:microsoft:office_long_term_servicing_channel:2024:*:*:*:*:-:x86:*
cpe:2.3:a:microsoft:office_long_term_servicing_channel:2024:*:*:*:*:macos:*:*
Vendors & Products Microsoft office Long Term Servicing Channel

Tue, 10 Feb 2026 20:15:00 +0000

Type Values Removed Values Added
References
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'active', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Tue, 10 Feb 2026 19:00:00 +0000

Type Values Removed Values Added
Metrics kev

{'dateAdded': '2026-02-10T00:00:00+00:00', 'dueDate': '2026-03-03T00:00:00+00:00'}


Tue, 10 Feb 2026 18:15:00 +0000

Type Values Removed Values Added
Description Reliance on untrusted inputs in a security decision in Microsoft Office Word allows an unauthorized attacker to bypass a security feature locally.
Title Microsoft Word Security Feature Bypass Vulnerability
First Time appeared Microsoft
Microsoft 365 Apps
Microsoft office 2021
Microsoft office 2024
Microsoft office Macos 2021
Microsoft office Macos 2024
Weaknesses CWE-807
CPEs cpe:2.3:a:microsoft:365_apps:*:*:*:*:enterprise:*:*:*
cpe:2.3:a:microsoft:office_2021:*:*:*:*:long_term_servicing_channel:*:*:*
cpe:2.3:a:microsoft:office_2024:*:*:*:*:long_term_servicing_channel:*:*:*
cpe:2.3:a:microsoft:office_macos_2021:*:*:*:*:*:long_term_servicing_channel:*:*
cpe:2.3:a:microsoft:office_macos_2024:*:*:*:*:*:long_term_servicing_channel:*:*
Vendors & Products Microsoft
Microsoft 365 Apps
Microsoft office 2021
Microsoft office 2024
Microsoft office Macos 2021
Microsoft office Macos 2024
References
Metrics cvssV3_1

{'score': 7.8, 'vector': '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'}


Subscriptions

Microsoft 365 Apps Office 2021 Office 2024 Office Long Term Servicing Channel Office Macos 2021 Office Macos 2024
cve-icon MITRE

Status: PUBLISHED

Assigner: microsoft

Published:

Updated: 2026-04-10T13:21:21.423Z

Reserved: 2025-12-30T18:10:54.845Z

Link: CVE-2026-21514

cve-icon Vulnrichment

Updated: 2026-02-10T18:24:47.129Z

cve-icon NVD

Status : Analyzed

Published: 2026-02-10T18:16:33.803

Modified: 2026-02-11T15:47:04.413

Link: CVE-2026-21514

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-04-15T17:45:10Z

Weaknesses