CVE-2026-21514

HIGH KEV

Microsoft Office Word - Info Disclosure

Title source: llm
STIX 2.1

Exploitation Summary

CVE-2026-21514 is actively exploited and listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added February 10, 2026. EIP tracks 1 public exploit from researchers including ChaitanyaHaritash.

AI-analyzed exploit summary This repository contains functional exploit code for CVE-2026-21514 and CVE-2026-21510, focusing on RTF and LNK file generation to bypass Protected View and achieve RCE. The scripts demonstrate technical details of the exploit chain, including obfuscation and payload delivery mechanisms.

Description

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

Exploits (1)

nomisec WORKING POC
by ChaitanyaHaritash · poc
https://github.com/ChaitanyaHaritash/CVE-2026-21514_CVE-2026-21510

This repository contains functional exploit code for CVE-2026-21514 and CVE-2026-21510, focusing on RTF and LNK file generation to bypass Protected View and achieve RCE. The scripts demonstrate technical details of the exploit chain, including obfuscation and payload delivery mechanisms.

Classification
Working Poc 90%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: Microsoft Office (specific version not specified)
No auth needed
Prerequisites: Network access to a controlled server hosting the malicious LNK file · Victim interaction to open the crafted RTF document
devstral-2 · analyzed May 05, 2026 Full analysis →

References (2)

Core 2

Scores

CVSS v3 7.8
EPSS 0.0533
EPSS Percentile 90.3%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation active
Automatable no
Technical Impact total

Details

CISA KEV 2026-02-10
VulnCheck KEV 2026-02-10
ENISA EUVD EUVD-2026-7334
CWE
CWE-807
Status published
Products (8)
microsoft/365_apps (2 CPE variants)
Microsoft/Microsoft 365 Apps for Enterprise 16.0.1 - https://aka.ms/OfficeSecurityReleases
Microsoft/Microsoft Office LTSC 2021 16.0.1 - https://aka.ms/OfficeSecurityReleases
Microsoft/Microsoft Office LTSC 2024 16.0.0 - https://aka.ms/OfficeSecurityReleases
Microsoft/Microsoft Office LTSC for Mac 2021 16.0.1 - 16.106.26020821
Microsoft/Microsoft Office LTSC for Mac 2024 16.0.0 - 16.106.26020821
microsoft/office_long_term_servicing_channel 2021 (3 CPE variants)
microsoft/office_long_term_servicing_channel 2024 (3 CPE variants)
Published Feb 10, 2026
KEV Added Feb 10, 2026
Tracked Since Feb 18, 2026