withastro up to 5.15.5 URL cross site scripting

Summaryinfo

A vulnerability was found in withastro astro up to 5.15.5. It has been classified as problematic. The impacted element is an unknown function of the component URL Handler. This manipulation causes cross site scripting. The identification of this vulnerability is CVE-2025-64745. It is possible to initiate the attack remotely. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in withastro astro up to 5.15.5. It has been declared as problematic. Affected by this vulnerability is an unknown code block of the component URL Handler. The manipulation with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. The summary by CVE is:

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 advisory is shared at github.com. This vulnerability is known as CVE-2025-64745 since 11/10/2025. The exploitation appears to be difficult. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1059.007 for this issue.

Upgrading to version 5.15.6 eliminates this vulnerability. Applying the patch 790d9425f39bbbb462f1c27615781cd965009f91 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2025-175382). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• withastro

Name

• astro

Version

• 5.15.0
• 5.15.1
• 5.15.2
• 5.15.3
• 5.15.4
• 5.15.5

License

• open-source

Website

• Product: https://github.com/withastro/astro/

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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