Angular up to 18.2.14 Element Attribute cross site scripting

Summaryinfo

A vulnerability marked as problematic has been reported in Angular up to 18.2.14. This impacts an unknown function of the component Element Attribute Handler. This manipulation causes cross site scripting. This vulnerability appears as CVE-2026-50557. The attack may be initiated remotely. There is no available exploit. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Angular up to 18.2.14. It has been declared as problematic. Affected by this vulnerability is an unknown code of the component Element Attribute Handler. The manipulation with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-50557 since 06/04/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1059.007 for this issue.

Upgrading to version 19.0.0-next.0 19.2.22, 20.0.0-next.0 20.3.22, 21.0.0-next.0 21.2.15 or 22.0.0-next.0 22.0.0-rc.2 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-38257). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

• JavaScript Library

Name

• Angular

Version

• 18.2.0
• 18.2.1
• 18.2.2
• 18.2.3
• 18.2.4
• 18.2.5
• 18.2.6
• 18.2.7
• 18.2.8
• 18.2.9
• 18.2.10
• 18.2.11
• 18.2.12
• 18.2.13
• 18.2.14

Website

• Product: https://github.com/angular/angular/

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If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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