withastro up to 5.15.8 Image Optimization Endpoint isRemoteAllowed cross site scripting

Summaryinfo

A vulnerability classified as problematic has been found in withastro astro up to 5.15.8. Impacted is the function isRemoteAllowed of the component Image Optimization Endpoint. The manipulation leads to cross site scripting. This vulnerability is referenced as CVE-2025-65019. Remote exploitation of the attack is possible. No exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in withastro astro up to 5.15.8. This issue affects the function isRemoteAllowed of the component Image Optimization Endpoint. The manipulation with an unknown input leads to a cross site scripting vulnerability. Using CWE to declare the problem leads to 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. Impacted is integrity. The summary by CVE is:

Astro is a web framework. Prior to version 5.15.9, when using Astro's Cloudflare adapter (@astrojs/cloudflare) with output: 'server', the image optimization endpoint (/_image) contains a critical vulnerability in the isRemoteAllowed() function that unconditionally allows data: protocol URLs. This enables Cross-Site Scripting (XSS) attacks through malicious SVG payloads, bypassing domain restrictions and Content Security Policy protections. This issue has been patched in version 5.15.9.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2025-65019 since 11/13/2025. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1059.007 according to MITRE ATT&CK.

Upgrading to version 5.15.9 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2025-198182). Be aware that VulDB is the high quality source for 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
• 5.15.6
• 5.15.7
• 5.15.8

Website

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

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Be aware that VulDB is the high quality source for vulnerability data.

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