Microsoft Visual Studio Code: Security feature bypass via incomplete denylist
Summary
Visual Studio Code contains an incomplete denylist of disallowed inputs (CWE-184), which allows an unauthenticated remote attacker to bypass a security feature. The attack requires that a user interacts with a malicious element, for example by opening a crafted repository or following a link. Successful exploitation can affect confidentiality, integrity and availability to a high degree.
Affected
- Microsoft Visual Studio Code from 1.0.0 before 1.145.3 (according to the CVE record)
Fixed in
- Microsoft Visual Studio Code 1.145.3 (according to the CVE record; not independently verified)
Workaround
Unknown.
Exploitation
- Microsoft rates exploit code maturity as Unproven (E:U).
- No public proof of concept found.
- No evidence of exploitation in the wild found.
- Not listed in CISA KEV at time of research (not directly verified).
Our recommendation
- Check the Microsoft Security Update Guide entry to confirm the fixed build.
- Update Visual Studio Code on all endpoints, especially developer workstations.
- Until patched, avoid opening untrusted repositories and keep Restricted Mode enabled.
- Recheck NVD and CISA KEV once analysis is published.
Information from Microsoft (Patch Tuesday November 2026)
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Microsoft Security Update Guide: CVE-2026-121663 msrc.microsoft.com
- CVE Record: CVE-2026-121663 www.cve.org
- VS Code 1.145 release notes code.visualstudio.com
- VS Code GitHub releases github.com
- Patch Tuesday November 2026 (Trinetriops) trinetriops.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 10 Nov 2026, 21:27.
Original description (NVD)
Incomplete list of disallowed inputs in Visual Studio Code allows an unauthorized attacker to bypass a security feature over a network.
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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