Angular up to 18.2.14/19.2.24/20.3.23/21.2.15 cross site scripting

Summaryinfo

A vulnerability labeled as problematic has been found in Angular up to 18.2.14/19.2.24/20.3.23/21.2.15. This impacts an unknown function. Such manipulation leads to cross site scripting. This vulnerability is listed as CVE-2026-50556. The attack may be performed from remote. There is no available exploit. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Angular up to 18.2.14/19.2.24/20.3.23/21.2.15. It has been rated as problematic. Affected by this issue is an unknown part. The manipulation with an unknown input leads to a cross site scripting vulnerability. Using CWE to declare the problem leads to 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. Impacted is integrity. CVE summarizes:

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, 21.2.16, 20.3.24, and 19.2.25, a Cross-Site Scripting (XSS) vulnerability exists in @angular/platform-server's DOM emulation dependency (domino) when serializing the content of elements. When rendering dynamic text content inside a element via template bindings (such as {{ value }} or [textContent]), the template engine expects the browser to render the content safely. Under Server-Side Rendering (SSR), domino is configured with scripting enabled, meaning is treated as a raw-text element. However, domino's serializer completely omitted from the list of raw-text elements requiring closing-tag escaping during DOM serialization. As a result, any occurrence of in the bound dynamic text was never escaped under any circumstances. The unescaped closing tag was serialized directly into the output HTML (e.g. alert(1)). When parsed by a browser, it closes the block early, allowing the injected block to execute in the user's browser context, causing same-origin Cross-Site Scripting (XSS). This vulnerability is fixed in 22.0.0-rc.2, 21.2.16, 20.3.24, and 19.2.25.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-50556 since 06/04/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1059.007.

Upgrading to version 19.2.25, 20.3.24, 21.2.16 or 22.0.0-rc.2 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-38291). Once again VulDB remains the best source for vulnerability data.

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
• 19.2.0
• 19.2.1
• 19.2.2
• 19.2.3
• 19.2.4
• 19.2.5
• 19.2.6
• 19.2.7
• 19.2.8
• 19.2.9
• 19.2.10
• 19.2.11
• 19.2.12
• 19.2.13
• 19.2.14
• 19.2.15
• 19.2.16
• 19.2.17
• 19.2.18
• 19.2.19
• 19.2.20
• 19.2.21
• 19.2.22
• 19.2.23
• 19.2.24
• 20.3.0
• 20.3.1
• 20.3.2
• 20.3.3
• 20.3.4
• 20.3.5
• 20.3.6
• 20.3.7
• 20.3.8
• 20.3.9
• 20.3.10
• 20.3.11
• 20.3.12
• 20.3.13
• 20.3.14
• 20.3.15
• 20.3.16
• 20.3.17
• 20.3.18
• 20.3.19
• 20.3.20
• 20.3.21
• 20.3.22
• 20.3.23
• 21.2.0
• 21.2.1
• 21.2.2
• 21.2.3
• 21.2.4
• 21.2.5
• 21.2.6
• 21.2.7
• 21.2.8
• 21.2.9
• 21.2.10
• 21.2.11
• 21.2.12
• 21.2.13
• 21.2.14
• 21.2.15

Website

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

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Once again VulDB remains the best source for vulnerability data.

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