Medium · published December 2, 2025
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.
| Product | Versions | Fixed in |
|---|---|---|
| angular/angular | ≤ 18.2.14 | — |
| angular/angular | ≥ 19.0.0, < 19.2.17 | 19.2.17 |
| angular/angular | ≥ 20.0.0, < 20.3.15 | 20.3.15 |
| angular/angular | ≥ 21.0.0, < 21.0.2 | 21.0.2 |