Angular is a development platform for building mobile and desktop web applications using TypeScript/JavaScript and other languages. Prior to 21.0.2, 20.3.15, and 19.2.17, A Stored Cross-Site Scripting (XSS) vulnerability has been identified in the Angular Template Compiler. It occurs because the compiler's internal security schema is incomplete, allowing attackers to bypass Angular's built-in security sanitization. Specifically, the schema fails to classify certain URL-holding attributes (e.g., those that could contain javascript: URLs) as requiring strict URL security, enabling the injection of malicious scripts. This vulnerability is fixed in 21.0.2, 20.3.15, and 19.2.17.
| Package (Ecosystem) | Introduced | Fixed | Limit |
|---|---|---|---|
| @angular/compiler(npm) | 21.0.0-next.0 | 21.0.2 | N/A |
| @angular/compiler(npm) | 20.0.0-next.0 | 20.3.15 | N/A |
| @angular/compiler(npm) | 19.0.0-next.0 | 19.2.17 | N/A |
| @angular/compiler(npm) | 0 | N/A | N/A |
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