Is CVE-2026-25545 actively exploited?

A proof-of-concept exploit is publicly available for CVE-2026-25545, but active exploitation has not been confirmed.

Can CVE-2026-25545 be exploited remotely?

Yes. CVE-2026-25545 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-25545?

CVE-2026-25545 has a CVSS score of 8.6 (HIGH) and an EPSS exploitation probability of 0.03%.

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HIGHPOC

CVE-2026-25545

CWE-918Published: February 24, 2026· Updated: Feb 25, 2026

8.6

CVSS v3.1

EPSS:0.04%probability of exploitation in 30 daysPercentile:11.5th

Official Description

Astro is a web framework. Prior to version 9.5.4, Server-Side Rendered pages that return an error with a prerendered custom error page (eg. `404.astro` or `500.astro`) are vulnerable to SSRF. If the `Host:` header is changed to an attacker's server, it will be fetched on `/500.html` and they can redirect this to any internal URL to read the response body through the first request. An attacker who can access the application without `Host:` header validation (eg. through finding the origin IP behind a proxy, or just by default) can fetch their own server to redirect to any internal IP. With this they can fetch cloud metadata IPs and interact with services in the internal network or localhost. For this to be vulnerable, a common feature needs to be used, with direct access to the server (no proxies). Version 9.5.4 fixes the issue.

NVD Source

Technical Analysis

CVE-2026-25545 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 8.6.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.

A proof-of-concept (PoC) exploit exists for CVE-2026-25545. While not yet confirmed in active campaigns, the availability of PoC code increases exploitation risk substantially.