Cross-site scripting in Visual Studio Code - CVE-2026-121664
Published: November 11, 2026
Vulnerability identifier: #VU165436
CSH Severity: Medium
CVSS v4: 2.1 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]
CVE-ID: CVE-2026-121664
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code in the context of the user.
The vulnerability exists due to improper neutralization of input during web page generation (cross-site scripting) in the extension details page in Visual Studio Code when rendering specially crafted extension content. A remote attacker can convince a user to open a specially crafted extension's details page and select a malicious link to execute arbitrary code in the user's context.
Affected software
Visual Studio Code
How to mitigate CVE-2026-121664
Install security update from vendor's website.
Visual Studio Code - update to 1.145.3