chore(deps): update dependency @angular/core to v21.2.4 [security]

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@angular/core (source)	21.2.1 → 21.2.4

GitHub Vulnerability Alerts

CVE-2026-32635

A Cross-Site Scripting (XSS) vulnerability has been identified in the Angular runtime and compiler. It occurs when the application uses a security-sensitive attribute (for example href on an anchor tag) together with Angular's ability to internationalize attributes. Enabling internationalization for the sensitive attribute by adding i18n-<attribute> name bypasses Angular's built-in sanitization mechanism, which when combined with a data binding to untrusted user-generated data can allow an attacker to inject a malicious script.

The following example illustrates the issue:

<a href="" i18n-href>Click me</a>

The following attributes have been confirmed to be vulnerable:

• action
• background
• cite
• codebase
• data
• formaction
• href
• itemtype
• longdesc
• poster
• src
• xlink:href

Impact

When exploited, this vulnerability allows an attacker to execute arbitrary code within the context of the vulnerable application's domain. This enables:

• Session Hijacking: Stealing session cookies and authentication tokens.
• Data Exfiltration: Capturing and transmitting sensitive user data.
• Unauthorized Actions: Performing actions on behalf of the user.

Attack Preconditions

1. The application must use a vulnerable version of Angular.
2. The application must bind unsanitized user input to one of the attributes mentioned above.
3. The bound value must be marked for internationalization via the presence of a i18n-<name> attribute on the same element.

Patches

• 22.0.0-next.3
• 21.2.4
• 20.3.18
• 19.2.20

Workarounds

The primary workaround is to ensure that any data bound to the vulnerable attributes is never sourced from untrusted user input (e.g., database, API response, URL parameters) until the patch is applied, or when it is, it shouldn't be marked for internationalization.

Alternatively, users can explicitly sanitize their attributes by passing them through Angular's DomSanitizer:

import {Component, inject, SecurityContext} from '@​angular/core';
import {DomSanitizer} from '@​angular/platform-browser';

@​Component({
  template: `
    <form action="" i18n-action>
      <button>Submit</button>
    </form>
  `,
})
export class App {
  url: string;

  constructor() {
    const dangerousUrl = 'javascript:alert(1)';
    const sanitizer = inject(DomSanitizer);
    this.url = sanitizer.sanitize(SecurityContext.URL, dangerousUrl) || '';
  }
}

References

• Fix 1
• Fix 2

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Release Notes

angular/angular (@​angular/core)

v21.2.4

Compare Source

compiler

Commit	Type	Description
ed2d324f9c	fix	disallow translations of iframe src

core

Commit	Type	Description
abbd8797bb	fix	reverts "feat(core): add support for nested animations"
d1dcd16c5b	fix	sanitize translated form attributes

v21.2.3

Compare Source

core

Commit	Type	Description
62a97f7e4b	fix	ensure definitions compile
21b1c3b2ee	fix	include signal debug names in their toString() representation
224e60ecb1	fix	sanitize translated attribute bindings with interpolations

v21.2.2

Compare Source

compiler

Commit	Type	Description
1df1697c6e	fix	prevent mutation of children array in RecursiveVisitor

compiler-cli

Commit	Type	Description
c822bf8e76	fix	always parenthesize object literals in TCB
05d022d5e6	fix	ignore generated ngDevMode signal branch for code coverage

forms

Commit	Type	Description
670d1660c4	feat	add 'blur' option to debounce rule

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