Angular is a development platform for building mobile and desktop web applications using TypeScript/JavaScript and other languages. Prior to 22.0.0-rc.2, 21.2.15, 20.3.22 and 19.2.22, an issue in the @angular/compiler and @angular/core packages allows bypassing element and attribute sanitization/validation through specific namespace workarounds. Specifically, namespaced script elements (e.g., <svg:script> or <:svg:script>) were not properly identified as script elements by the Angular template preparser, allowing them to pass through template compilation without being stripped. Furthermore, security context schema mappings for element attributes did not consistently handle attributes within namespaced elements (like SVG and MathML), opening up gaps where malicious namespaced attributes could bypass runtime and compile-time sanitizers. Combined, these flaws enable an attacker who can inject or supply a template/tag structure with custom namespaces to bypass Angular's script-stripping logic and attribute sanitizers, leading to client-side Cross-Site Scripting (XSS). This vulnerability is fixed in 22.0.0-rc.2, 21.2.15, 20.3.22 and 19.2.22.
Angular: Template and Attribute Namespace Sanitization Bypass (XSS)
Problem type
Affected products
angular
>= 21.0.0-next.0 < 21.2.15 - AFFECTED
>= 22.0.0-next.0 < 22.0.0-rc.2 - AFFECTED
>= 20.0.0-next.0 < 20.3.22 - AFFECTED
>= 19.0.0-next.0 < 19.2.22 - AFFECTED
<= 18.2.14 - AFFECTED
References
https://github.com/angular/angular/security/advisories/GHSA-f3m7-gqxr-g87x
https://github.com/angular/angular/pull/68689
https://github.com/angular/angular/pull/68868
GitHub Security Advisories
GHSA-f3m7-gqxr-g87x
Angular: Template and Attribute Namespace Sanitization Bypass (XSS)
https://github.com/advisories/GHSA-f3m7-gqxr-g87xAn issue in the @angular/compiler and @angular/core packages allows bypassing element and attribute sanitization/validation through specific namespace workarounds.
Specifically, namespaced script elements (e.g., <svg:script> or <:svg:script>) were not properly identified as script elements by the Angular template preparser, allowing them to pass through template compilation without being stripped.
Furthermore, security context schema mappings for element attributes did not consistently handle attributes within namespaced elements (like SVG and MathML), opening up gaps where malicious namespaced attributes could bypass runtime and compile-time sanitizers.
Combined, these flaws enable an attacker who can inject or supply a template/tag structure with custom namespaces to bypass Angular's script-stripping logic and attribute sanitizers, leading to client-side Cross-Site Scripting (XSS).
Impact
Any Angular application that compiles user-controlled templates at runtime, or relies on sanitization of namespaced elements/attributes, is vulnerable to this security bypass.
Once exploited, this allows a malicious actor to inject a namespaced script element or dynamic attribute bindings, bypassing core sanitization constraints to execute arbitrary JavaScript within the target user's browser context. This could lead to session hijacking, sensitive data exposure, or unauthorized actions on behalf of the user.
Attack Preconditions
To successfully exploit these vulnerabilities, the following environment parameters and application states must all concurrently exist:
- User-Controlled Template Input: The application must accept user-controlled inputs that are directly processed by the Angular template compiler at runtime.
- Namespace Parsing Support: The input structure must employ custom namespace prefixes (such as
<svg:script>) to evade standard tag-name blocklists/checks. - Absence of Additional Context Sanitization: The application does not perform separate input sanitization before feeding values to the Angular compiler.
Patches
- 22.0.0-rc.2
- 21.2.15
- 20.3.22
- 19.2.23
JSON source
https://cveawg.mitre.org/api/cve/CVE-2026-50557Click to expand
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"dateUpdated": "2026-06-22T17:54:55.320Z",
"dateReserved": "2026-06-04T21:34:34.426Z",
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