SB2026091146 - Multiple vulnerabilities in Angular

Description

This security bulletin contains information about 2 vulnerabilities.

1) Cross-site scripting (CVE-ID: CVE-2026-50555)

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVSSv4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]

The vulnerability allows a remote attacker to execute arbitrary script in a user\'s browser.

The vulnerability exists due to a Unicode index alignment error in domino\'s closing-tag escaping logic when serializing user-controlled dynamic text in raw-text elements during server-side rendering. A remote attacker can supply dynamic text containing an astral Unicode character and a closing tag to execute arbitrary script in a user\'s browser.

User interaction is required to visit the rendered page.

2) Cross-site scripting (CVE-ID: CVE-2026-50556)

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVSSv4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]

The vulnerability allows a remote attacker to execute arbitrary script in a user\'s browser context.

The vulnerability exists due to improper neutralization of input during web page generation in the domino serializer used by @angular/platform-server when serializing dynamic text content within tag and injected script to execute arbitrary script in a user\'s browser context.

User interaction is required to visit an SSR-rendered page that binds user-controlled data inside a

Remediation

Install update from vendor's website.

References

• https://github.com/angular/angular/security/advisories/GHSA-hqr9-c56f-3x7f
• https://github.com/angular/domino/pull/29
• https://github.com/angular/angular/security/advisories/GHSA-gxx4-3xcv-f8qx