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Angular SSR Request Vulnerability Allows Attackers to Trick Applications into Sending Unauthorized Requests

## Cybersecurity: Angular SSR Vulnerability

CBy Carter HartwellMar 02, 20262 min read

Cybersecurity: Angular SSR Vulnerability

A critical vulnerability has been identified in Angular Server-Side Rendering (SSR) , enabling attackers to induce applications to send unauthorized requests.

Designated as CVE-2026-27739, this Server-Side Request Forgery (SSRF) flaw significantly threatens web applications utilizing certain Angular framework versions.

The vulnerability arises from Angular's internal URL reconstruction logic, specifically when handling user-controlled HTTP headers.

The framework inadequately validates the Host and X-Forwarded-* headers, resulting in potential unauthorized domain access.

Angular SSR uses HTTP headers to ascertain the application's base origin. However, it does not ensure that the Host and X-Forwarded-Host headers originate from a verified source.

This oversight can lead to the application’s base URL being redirected to an external, malicious domain.

The framework also fails to sanitize the X-Forwarded-Host header concerning path segments or special characters.

The vulnerability arises from Angular's internal URL reconstruction logic, specifically when handling user-controlled HTTP headers.
Carter Hartwell · Thehackingpost

Moreover, it does not verify the numeric integrity of the X-Forwarded-Port header, allowing for malformed URI construction and injection attacks.

Base Origin Manipulation: HttpClient may resolve URLs to attacker-controlled servers. Unsafe URL Construction: Unvalidated REQUEST headers may redirect traffic to malicious endpoints.

If exploited, CVE-2026-27739 permits arbitrary internal request routing, posing significant risks to affected applications.

Attackers can leverage this flaw to extract sensitive credentials, such as Authorization headers or session cookies , by redirecting them to their servers.

This vulnerability also facilitates internal network probing, enabling unauthorized access and data transmission from internal services, databases, or cloud metadata endpoints.

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Consequently, sensitive information processed on the server could be exposed, leading to severe confidentiality breaches. The Angular team has issued patches to rectify this critical flaw.

According to Angular's advisory on GitHub , users are strongly recommended to update to the following secure versions: 21.2.0-rc.1, 21.1.5, 20.3.17, and 19.2.21.

Organizations unable to upgrade immediately can implement workarounds. Developers should refrain from using req.headers for URL construction, opting instead for absolute URLs with trusted base API paths.

Additionally, employing strict header validation middleware in the server.ts file can enforce numeric ports and validated hostnames, mitigating exploitation risks.

Based on reporting by Cyber Security News.

AI transparency. This article was produced with the assistance of artificial intelligence and published under human editorial oversight. AI systems can make mistakes. Read how we use AI (EU AI Act, Art. 50).
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