# CVE-2026-121665: Visual Studio Code trust boundary violation

Source: https://junglewise.ai/threats/cve-2026-121665-trust-boundary-violation-in-visual-studio-code-allows-an  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-10. Updated: 2026-11-10  
License: CC BY 4.0 with a link back

CVE-2026-121665 · Severity: high · CVSS 8.8 · Published 2026-11-10

Visual Studio Code is a widely-used code editor that developers rely on for building applications. This vulnerability allows an attacker on the network to bypass a security feature, potentially gaining unauthorized access to code, secrets, or development environments. An attacker would not need special privileges or user interaction to exploit this flaw.

Technologies: [Microsoft Visual Studio Code](https://junglewise.ai/threats/technologies/visual-studio-code). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-121665 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-121665 being exploited in the wild.

**How severe is CVE-2026-121665?** High severity, with a CVSS score of 8.8, published 10 November 2026.

**Which products and versions are affected?** Microsoft Visual Studio Code.

**Is there a fix for CVE-2026-121665?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-121665 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-121665?** Check whether you run Microsoft Visual Studio Code. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A trust boundary violation in Visual Studio Code permits an attacker to bypass a security feature via network-based attack without authentication. The vulnerability allows unauthorized access across trust boundaries, potentially exposing sensitive development artifacts or permitting lateral movement. The reported CVSS 8.8 score indicates high impact availability, integrity, or confidentiality damage.

## Affected products

- Microsoft Visual Studio Code

## Timeline

- 2026-11-10: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-121665](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-121665)

## Related threats

- [Microsoft Visual Studio Code untrusted search path remote code execution](https://junglewise.ai/threats/cve-2026-70094-untrusted-search-path-in-visual-studio-code-allows-an)
- [Microsoft Visual Studio Code cross-site scripting](https://junglewise.ai/threats/cve-2026-121664-improper-neutralization-of-input-during-web-page-generation)
- [Microsoft Visual Studio Code incomplete input validation security bypass](https://junglewise.ai/threats/cve-2026-121663-incomplete-list-of-disallowed-inputs-in-visual-studio-code)
- [Visual Studio Code command injection vulnerability](https://junglewise.ai/threats/cve-2026-121662-improper-neutralization-of-special-elements-used-in-a-command)
- [Microsoft Visual Studio Code security feature bypass](https://junglewise.ai/threats/cve-2026-121661-incomplete-list-of-disallowed-inputs-in-visual-studio-code)