CVE-2026-21516Network attack vector

Code execution via undisclosed command injection

Published Feb 10, 2026 · Updated Feb 10, 2026

Command injection in Microsoft GitHub Copilot plugin for JetBrains IDEs before 1.5.63 allows remote attackers to execute code. Microsoft has not disclosed the vulnerable component, the command being constructed, or how network-supplied input reaches it. Exploitation requires user interaction; successful attacks run code with the privileges of the affected IDE process.

CVSS severity8.8
High
EPSS probability0.82%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Command injection in Microsoft GitHub Copilot plugin for JetBrains IDEs before 1.5.63 allows remote attackers to execute code. Microsoft has not disclosed the vulnerable component, the command being constructed, or how network-supplied input reaches it. Exploitation requires user interaction; successful attacks run code with the privileges of the affected IDE process.

The record

CVE
CVE-2026-21516
Published
Feb 10, 2026
Updated
Feb 10, 2026
Vendor
Microsoft
Product
GitHub Copilot plugin for JetBrains IDEs
Classifications
CWE-77, T1204
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.0.0 <1.5.63

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Microsoft · GitHub Copilot plugin for JetBrains IDEsversion=1.0.0 <1.5.63

Published CVSS scores

8.8Microsoft CorporationCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
T1204User Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo