angular Angular.ng-template up to 21.2.3 Language Service client/src/client.ts cross site scripting

Summaryinfo

A vulnerability was found in angular Angular.ng-template up to 21.2.3 and classified as problematic. This affects an unknown part of the file client/src/client.ts of the component Language Service. The manipulation results in cross site scripting. This vulnerability is identified as CVE-2026-50178. The attack can be executed remotely. There is not any exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic has been found in angular Angular.ng-template up to 21.2.3. Affected is an unknown code of the file client/src/client.ts of the component Language Service. The manipulation with an unknown input leads to a cross site scripting vulnerability. CWE is classifying the issue as CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. This is going to have an impact on integrity. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-50178 since 06/04/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1059.007 by the MITRE ATT&CK project.

Upgrading to version 21.2.4 eliminates this vulnerability.

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Productinfo

Type

• JavaScript Library

Vendor

• angular

Name

• Angular.ng-template

Version

• 21.2.0
• 21.2.1
• 21.2.2
• 21.2.3

CPE 2.3info

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• 🔒
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CPE 2.2info

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