CVE-2025-64745

Astro is a web framework. Starting in version 5.2.0 and prior to version 5.15.6, a Reflected Cross-Site Scripting (XSS) vulnerability exists in Astro's development server error pages when the `trailingSlash` configuration option is used. An attacker can inject arbitrary JavaScript code that executes in the victim's browser context by crafting a malicious URL. While this vulnerability only affects the development server and not production builds, it could be exploited to compromise developer environments through social engineering or malicious links. Version 5.15.6 fixes the issue.

The following products are affected by CVE-2025-64745 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2025-64745.

URL	Resource
https://github.com/withastro/astro/blob/5bc37fd5cade62f753aef66efdf40f982379029a/packages/astro/src/template/4xx.ts#L133-L149
https://github.com/withastro/astro/commit/790d9425f39bbbb462f1c27615781cd965009f91
https://github.com/withastro/astro/pull/12994
https://github.com/withastro/astro/security/advisories/GHSA-w2vj-39qv-7vh7