CVE-2025-66412: Angular Stored XSS Vulnerability via SVG Animation, SVG URL and MathML Attributes

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-12-01 · updated 2026-10-18
Weakness: CWE-79

Description

Angular is a development platform for building mobile and desktop web applications using TypeScript/JavaScript and other languages. Prior to 21.0.2, 20.3.15, and 19.2.17, A Stored Cross-Site Scripting (XSS) vulnerability has been identified in the Angular Template Compiler. It occurs because the compiler's internal security schema is incomplete, allowing attackers to bypass Angular's built-in security sanitization. Specifically, the schema fails to classify certain URL-holding attributes (e.g., those that could contain javascript: URLs) as requiring strict URL security, enabling the injection of malicious scripts. This vulnerability is fixed in 21.0.2, 20.3.15, and 19.2.17.

Affected products

angular: through 18.2.14; from 19.0.0 before 19.2.17; from 20.0.0 before 20.3.15; from 21.0.0 before 21.0.2 — fixed in 19.2.17, 20.3.15, 21.0.2

How to fix

Upgrade to a fixed version: angular 19.2.17, 20.3.15, 21.0.2. Check the vendor advisory for mitigations.

References

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