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Advisory severityMedium6.1Red Hat Linux

Medium [CVE-2026-50557] @angular/compiler: @angular/core: Angular: Template and Attribute Namespace Sanitization Bypass (XSS)

This medium-severity Red Hat Linux advisory covers CVE-2026-50557 affecting Red Hat Advanced Cluster Management for Kubernetes 2, Red Hat build of Apicurio Registry 3.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-50557 Source published Source updated

VulniPulse record published Record updated

CVE-2026-50557
Affected products & platforms
Red Hat LinuxUnclassified
Open source advisory

Summary

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., or ) 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.

This vulnerability only affects Angular 2+ (versions 19.x through 22.x); AngularJS 1.x is a different codebase and is not affected. Red Hat products shipping AngularJS 1.x (such as firefox, grafana, and thunderbird) are not impacted by this flaw.

Is CVE-2026-50557 exploited?

No exploitation is reported in the sources VulniPulse tracks: CVE-2026-50557 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.

How do I fix CVE-2026-50557?

Upgrade to a fixed release named by Red Hat:

  • 22.0.0
  • 21.2.15
  • 20.3.22
  • 19.2.22

Confirm against the vendor advisory before you patch.

Affected versions
  • < 22.0.0-rc
  • < 21.2.15
  • < 20.3.22
  • < 19.2.22

Official advisory · high-confidence parse· fetched 14 days ago·verify at source

Fixed versions
  • 22.0.0
  • 21.2.15
  • 20.3.22
  • 19.2.22

Official advisory · high-confidence parse· fetched 14 days ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

Official advisory · high-confidence parse· fetched 14 days ago·verify at source

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