chore(deps): update dependency @angular/compiler to v21.0.2 [security]

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@angular/compiler (source)	21.0.0 -> 21.0.2

GitHub Vulnerability Alerts

CVE-2025-66412

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.

Additionally, a related vulnerability exists involving SVG animation elements (<animate>, <set>, <animateMotion>, <animateTransform>). The attributeName attribute on these elements was not properly validated, allowing attackers to dynamically target security-sensitive attributes like href or xlink:href on other elements. By binding attributeName to "href" and providing a javascript: URL in the values or to attribute, an attacker could bypass sanitization and execute arbitrary code.

Attributes confirmed to be vulnerable include:

• SVG-related attributes: (e.g., xlink:href), and various MathML attributes (e.g., math|href, annotation|href).
• SVG animation attributeName attribute when bound to "href" or "xlink:href".

When template binding is used to assign untrusted, user-controlled data to these attributes (e.g., [attr.xlink:href]="maliciousURL" or <animate [attributeName]="'href'" [values]="maliciousURL">), the compiler incorrectly falls back to a non-sanitizing context or fails to block the dangerous attribute assignment. This allows an attacker to inject a javascript:URL payload. Upon user interaction (like a click) on the element, or automatically in the case of animations, the malicious JavaScript executes in the context of the application's origin.

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.

Patches

• 19.2.17
• 20.3.15
• 21.0.2

Attack Preconditions

• The victim's Angular application must render data derived from untrusted input (e.g., from a database or API) and bind it to one of the unsanitized URL attributes or the attributeName of an SVG animation element.
• The victim must perform a user interaction (e.g., clicking) on the compromised element for the stored script to execute, or the animation must trigger the execution.

Workarounds

If you cannot upgrade, you can workaround the issue by ensuring that any data bound to the vulnerable attributes is never sourced from untrusted user input (e.g., database, API response, URL parameters).

• Avoid Affected Template Bindings: Specifically avoid using template bindings (e.g., [attr.xlink:href]="maliciousURL") to assign untrusted data to the vulnerable SVG/MathML attributes.
• Avoid Dynamic attributeName on SVG Animations: Do not bind untrusted data to the attributeName attribute of SVG animation elements (<animate>, <set>, etc.).
• Enable Content Security Policy (CSP): Configure a robust CSP header that disallows javascript: URLs.

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Release Notes

angular/angular (@​angular/compiler)

v21.0.2

Compare Source

compiler

Commit	Type	Description
78fd159b78	fix	prevent XSS via SVG animation attributeName and MathML/SVG URLs

v21.0.1

Compare Source

compiler-cli

Commit	Type	Description
39c577bc36	fix	do not type check native controls with ControlValueAccessor
8d3a89a477	fix	escape angular control flow in jsdoc
bc34083d34	fix	ignore non-existent files

core

Commit	Type	Description
0ea1e07174	fix	apply bootstrap-options migration to platformBrowserDynamic
70507b8c1c	fix	debug data causing memory leak for root effects
a55482fca3	fix	notify profiler events in case of errors
49ad7c6508	fix	use injected DOCUMENT for CSP_NONCE
cc1ec09931	perf	avoid repeat searches for field directive

forms

Commit	Type	Description
7d5c7cf99a	feat	add DI option for classes on Field directive
8acf5d2756	fix	allow dynamic type bindings on signal form controls
de5fca94c5	fix	run reset as untracked

http

Commit	Type	Description
3240d856d9	fix	prevent XSRF token leakage to protocol-relative URLs

migrations

Commit	Type	Description
f394215b14	fix	detect structural ngTemplateOutlet and ngComponentOutlet

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