Critical Security Flaw in Angular.js: Untrusted Input Serialization Vulnerability
Summary
DEBIAN-CVE-2026-88060: Angular is a development platform for building mobile and desktop web applications using TypeScript/JavaScript and other languages. Affects angular.js versions 1.8.3-1 – 1.8.3-3. No fix is published. How to fix ↓
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Background
Angular.js is a widely-used development platform for building mobile and desktop web applications using TypeScript, JavaScript, and other languages. It provides a robust framework for creating dynamic web applications, with features like two-way data binding, dependency injection, and modular architecture. However, prior to versions 20.3.30, 21.2.22, and 22.1.4, Angular.js had a significant vulnerability in its server-side rendering (SSR) capabilities, which could lead to severe security risks.
Vulnerability Detail
The vulnerability arises from Angular's server-side rendering (SSR) mechanism in the @angular/platform-server package, which improperly serializes untrusted input within template content. This issue affects fallback raw-content elements such as noscript, iframe, noembed, and noframes. The Domino serializer's traversal of fallbackRawContentTags fails to escape matching closing tags in various nodes, allowing unescaped closing tags to be interpreted as active DOM elements. This can lead to arbitrary JavaScript execution when HTML5 RAWTEXT browser parsing encounters these unescaped tags, posing a significant security threat.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a temporary workaround, avoid using untrusted input in template content and ensure that any dynamic content is properly sanitized before rendering. Additionally, consider using strict schemas like CUSTOM_ELEMENTS_SCHEMA or NO_ERRORS_SCHEMA to mitigate risks.
Conclusion
The Angular.js vulnerability CVE-2026-88060 poses a serious risk due to improper handling of untrusted input in server-side rendering. It is crucial to update to the patched versions to safeguard your applications against potential exploitation. Implementing best practices for input handling can also help mitigate risks.
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FAQ
The vulnerability allows for arbitrary JavaScript execution due to improper serialization of untrusted input in Angular's server-side rendering.
Versions prior to 20.3.30, 21.2.22, and 22.1.4 are affected by this vulnerability.
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Exploitation of this vulnerability can lead to arbitrary code execution, which may compromise the security of the application and its users.
Yes, you can implement strict input validation and sanitization, and avoid using untrusted input in your templates as a temporary measure.
References
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