Vulnerability · Published Feb 10, 2026 · Assigned by microsoft
CVE-2026-21537Microsoft Defender for Endpoint Linux Extension Remote Code Execution Vulnerability
High 8.8
In plain English
A high-severity code injection in Microsoft Defender for Endpoint for Linux from Microsoft. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 45% of all known vulnerabilities).
Severity (CVSS 3.1)8.8High
Exploit odds (30 days)0.5%top 55.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Microsoft Defender for Endpoint for Linux | 101.0.0 – before 1.0.9.0 |
Weakness: CWE-94 · Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
References
- Microsoft Defender for Endpoint Linux Extension Remote Code Execution Vulnerability vendor-advisory, patch