CVE-2026-50178
HighCVSS 8.8Exploitation Probability (EPSS)
Low risk16th percentile - higher than 16% of all known CVEs
Summary
The Angular Language Service VS Code extension configures the tooltip Markdown renderer with isTrusted: true, allowing active command: URIs. The language server fails to sanitize JSDoc strings, enabling an attacker to inject malicious command links. When a developer hovers over a symbol and clicks the link, the command executes on their host machine.
Risk Assessment
The risk involves potential remote code execution on the developer's machine by clicking a crafted tooltip, which could lead to compromise of the development environment and data theft.
Recommendation
Immediately update the Angular Language Service extension to version 21.2.4 or later, which contains the fix for this vulnerability.
Original NVD description (English source)
The Angular Language Service VS Code Extension provides a rich editing experience for Angular templates. the client-side Angular Language Service VS Code extension configures the tooltip Markdown renderer with the isTrusted: true option (located in client/src/client.ts). This setting instructs VS Code to trust all rendered content it receives, which enables active elements such as command: URIs. However, the background Angular Language Server process fails to escape or sanitize brackets, raw links, and control characters from JSDoc strings before forwarding the hover Markdown content (located in server/src/handlers/hover.ts and server/src/text_render.ts). An attacker can leverage this behavior by crafting a project TypeScript or JavaScript file (or a third-party npm package dependency) containing a malicious JSDoc tooltip with an embedded active command link. When a developer hovers over the target symbol to render the tooltip and clicks the malicious link, the IDE executes the command sequence directly on the developer's host machine. Prior to 21.2.4, This vulnerability is fixed in 21.2.4.