Is this vulnerability remotely exploitable?

Yes. An external attacker who can send HTTP requests directly to the Astro application and control the `Host` header can exploit this SSRF behavior, assuming there is no effective host validation or protective proxy in place.

Does exploitation require authentication or special privileges?

Typically no. The described scenario relies on unauthenticated access to the application's HTTP endpoint and the ability to trigger an error that leads to rendering a custom error page. However, if the application is behind authentication, the attacker would need whatever level of access is required to hit routes that can produce such errors.

What is the safest general fix pattern?

The safest pattern is to strictly validate or normalize the `Host` header at the earliest entry point, and to ensure error page resolution does not depend on untrusted request headers. Additionally, server-side requests should be constrained via allowlists and network controls so that only explicitly trusted destinations are reachable.

Severity:

HIGH RISK

(8.6)

Server-Side Request Forgery (CWE-918) in Astro Custom Error Page Rendering

CVE-2026-25545

Published:

Feb 23, 2026

Status:

Analyzed

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

Remote Code Execution on the Router

April 6, 2026

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Remote Code Execution on Router Firmware

April 6, 2026

Vulnerability Type

Category:

Server-Side Request Forgery (SSRF)

CWE:

CWE-918

Impact:

Server-Side Request Forgery leading to internal network access and potential cloud metadata exposure

Severity:

HIGH RISK

(8.6)

CVSS Version:

3.1

Vulnerability Type

Category:

Server-Side Request Forgery (SSRF)

CWE:

CWE-918

Impact:

Server-Side Request Forgery leading to internal network access and potential cloud metadata exposure

Severity:

HIGH RISK

(8.6)

CVSS Version:

3.1

Catch This CVE While Code Is Being Written

Detect vulnerable code directly in pull requests, so CVEs are fixed before merge.

Get Started

Ship clean & secure code faster

START 14 DAYS FREE TRIAL

BOOK A DEMO

Made with Love in San Francisco

355 Bryant St. San Francisco, CA 94107, USA

Ask AI for summary of CodeAnt

Made with Love in San Francisco

355 Bryant St. San Francisco, CA 94107, USA

Ask AI for summary of CodeAnt

Made with Love in San Francisco

355 Bryant St. San Francisco, CA 94107, USA

Ask AI for summary of CodeAnt

Server-Side Request Forgery (CWE-918) in Astro Custom Error Page Rendering

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

Product

Pricing

Company

Legal

Developers

Compare

Product

Pricing

Company

Legal

Developers

Compare

Product

Pricing

Company

Legal

Developers

Compare