# CVE-2026-121663: Microsoft Visual Studio Code incomplete input validation security bypass

Source: https://junglewise.ai/threats/cve-2026-121663-incomplete-list-of-disallowed-inputs-in-visual-studio-code  
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-2026-121663 · Severity: high · CVSS 8.8 · Published 2026-11-10

Visual Studio Code, a widely-used code editor, contains an incomplete list of disallowed inputs that allows attackers to bypass a security feature remotely. An attacker can exploit this over a network to circumvent protections intended to prevent unauthorized actions, potentially leading to unauthorized code execution or data access.

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-2026-121663 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-121663 being exploited in the wild.

**How severe is CVE-2026-121663?** High severity, with a CVSS score of 8.8, published 10 November 2026.

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

**Is there a fix for CVE-2026-121663?** 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-2026-121663 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-121663?** Check whether you run Microsoft Visual Studio Code at an affected version. 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

Visual Studio Code fails to validate all potentially dangerous inputs against a security blocklist, allowing attackers to bypass input validation controls remotely. The incomplete filter enables an attacker to craft malicious input that passes validation checks designed to prevent security violations. A network-based attack vector means the vulnerability can be exploited without local access or user interaction beyond normal editor use.

## Affected products

- Microsoft Visual Studio Code <UNKNOWN>

## Timeline

- 2026-11-10: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-121663](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-121663)

## 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)
- [Visual Studio Code trust boundary violation](https://junglewise.ai/threats/cve-2026-121665-trust-boundary-violation-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)
- [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)