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Vulnerability record · CVE-2026-21537 · published 10 February 2026

CVE-2026-21537: Microsoft defender for endpoint code injection vulnerability

Microsoft · Defender For Endpoint

Improper control of generation of code ('code injection') in Microsoft Defender for Linux allows an unauthorized attacker to execute code over an adjacent network.

8.8 CVSS 3.1 High EPSS 0.56% · top 55.7% CWE-94 · Code injection
8.8CVSS 3.1 base score
0.56%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
1References
17 Jun 2026Last modified by NVD

Description

Improper control of generation of code ('code injection') in Microsoft Defender for Linux allows an unauthorized attacker to execute code over an adjacent network.

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21537 Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

8.1CVE-2024-49057Microsoft defender for endpoint improper input validation vulnerabilityMicrosoft Defender for Endpoint on Android Spoofing VulnerabilityEPSS 1.7%7.8CVE-2025-47161Microsoft defender for endpoint improper access control vulnerabilityImproper access control in Microsoft Defender for Endpoint allows an authorized attacker to elevate privileges locally.EPSS 0.80%7.8CVE-2024-21315Microsoft defender for endpoint improper input validation vulnerabilityMicrosoft Defender for Endpoint Protection Elevation of Privilege VulnerabilityEPSS 0.64%7.8CVE-2022-35828Microsoft defender for endpoint vulnerabilityMicrosoft Defender for Endpoint for Mac Elevation of Privilege VulnerabilityEPSS 0.53%7.0CVE-2026-56178Microsoft defender for endpoint toctou race condition vulnerabilityTime-of-check time-of-use (toctou) race condition in Microsoft Defender for Endpoint allows an authorized attacker to elevate privileges locally.EPSS 0.23%7.0CVE-2026-50658Microsoft defender for endpoint toctou race condition vulnerabilityTime-of-check time-of-use (toctou) race condition in Microsoft Defender allows an authorized attacker to elevate privileges locally.EPSS 0.20%7.0CVE-2026-45647Microsoft defender for endpoint toctou race condition vulnerabilityTime-of-check time-of-use (toctou) race condition in Microsoft Defender for Endpoint allows an authorized attacker to elevate privileges locally.EPSS 0.23%6.7CVE-2025-26684Microsoft defender for endpoint vulnerabilityExternal control of file name or path in Microsoft Defender for Endpoint allows an authorized attacker to elevate privileges locally.EPSS 0.42%

Source: NIST National Vulnerability Database (record CVE-2026-21537), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.