chore(deps): update dependency @angular/compiler to v20.3.16 [security]#2430
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This PR contains the following updates:
20.3.2→20.3.16GitHub 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>). TheattributeNameattribute on these elements was not properly validated, allowing attackers to dynamically target security-sensitive attributes likehreforxlink:hrefon other elements. By bindingattributeNameto "href" and providing ajavascript:URL in thevaluesortoattribute, an attacker could bypass sanitization and execute arbitrary code.Attributes confirmed to be vulnerable include:
xlink:href), and various MathML attributes (e.g.,math|href,annotation|href).attributeNameattribute 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 ajavascript:URLpayload. 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:
Patches
Attack Preconditions
attributeNameof an SVG animation element.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).
[attr.xlink:href]="maliciousURL") to assign untrusted data to the vulnerable SVG/MathML attributes.attributeNameon SVG Animations: Do not bind untrusted data to theattributeNameattribute of SVG animation elements (<animate>,<set>, etc.).javascript:URLs.CVE-2026-22610
A Cross-Site Scripting (XSS) vulnerability has been identified in the Angular Template Compiler. The vulnerability exists because Angular’s internal sanitization schema fails to recognize the
hrefandxlink:hrefattributes of SVG<script>elements as a Resource URL context.In a standard security model, attributes that can load and execute code (like a script's source) should be strictly validated. However, because the compiler does not classify these specific SVG attributes correctly, it allows attackers to bypass Angular's built-in security protections.
When template binding is used to assign user-controlled data to these attributes for example,
<script [attr.href]="userInput">the compiler treats the value as a standard string or a non-sensitive URL rather than a resource link. This enables an attacker to provide a malicious payload, such as adata:text/javascriptURI or a link to an external malicious script.Impact
When successfully exploited, this vulnerability allows for arbitrary JavaScript execution within the context of the victim's browser session. This can lead to:
Attack Preconditions
<script>elements within its templates.hreforxlink:hrefattributes of those SVG scripts.Patches
Workarounds
Until the patch is applied, developers should:
[attr.href]) for SVG<script>elements.Resources
Release Notes
angular/angular (@angular/compiler)
v20.3.16Compare Source
core
v20.3.15Compare Source
compiler
attributeNameand MathML/SVG URLsv20.3.14Compare Source
http
v20.3.13Compare Source
v20.3.12Compare Source
v20.3.11Compare Source
common
compiler
core
v20.3.10Compare Source
compiler-cli
migrations
v20.3.9Compare Source
v20.3.7Compare Source
animations
Element.animateexceptions (#64506)compiler
compiler-cli
core
router
v20.3.6Compare Source
core
platform-browser
DomEventsPluginshould always be the last plugin to be called forsupports(). (#50394)v20.3.5Compare Source
compiler-cli
core
animate.leavefunction bindings (#64413)migrations
router
v20.3.4Compare Source
core
migrations
v20.3.3Compare Source
compiler
core
migrations
Configuration
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