GitHub Copilot for JetBrains IDEs: Information disclosure via command injection
Summary
Microsoft's GitHub Copilot plugin for JetBrains IDEs contains a command injection flaw (CWE-77) that allows an authorized local user to disclose information. The attack vector is local and requires low privileges, with no user interaction needed. The impact is limited to confidentiality, and Microsoft rates the flaw as Medium with CVSS 5.5.
Affected
- Microsoft GitHub Copilot Plugin for JetBrains IDEs, versions 1.0.0 to before 1.17.0-251
Fixed in
- Version 1.17.0-251 or later (as implied by the affected range; not yet verified against the vendor advisory)
Workaround
Unknown.
Exploitation
- Microsoft lists exploitation as "No" and public disclosure as "No".
- CISA SSVC: Exploitation none, Automatable no, Technical Impact partial.
- No public proof-of-concept or exploit code found.
Our recommendation
- Inventory JetBrains IDEs with the GitHub Copilot plugin, especially on shared or privileged workstations.
- Update the plugin to 1.17.0-251 or later and verify the version on each machine.
- Rotate credentials stored in developer workspaces if misuse is suspected.
- Re-check the MSRC advisory and NVD, since NVD analysis is still pending.
Information from Microsoft (Patch Tuesday November 2026)
- Severity (Microsoft)
- Important
- Impact
- Information disclosure – Github Copilot
- Status on Patch Tuesday
- Neither exploited nor publicly disclosed
- Product family
- Other
- Updates (KB)
- KB1163583
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- CVE Record CVE-2026-83953 www.cve.org
- Microsoft Security Update Guide CVE-2026-83953 msrc.microsoft.com
- Rapid7 Patch Tuesday November 2026 www.rapid7.com
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 11 Nov 2026, 16:38.
Original description (NVD)
Improper neutralization of special elements used in a command ('command injection') in Github Copilot allows an authorized attacker to disclose information locally.
NVD references (1)
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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