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astro

Astro is a web framework. Prior to version 5.15.8, a reflected XSS vulnerability is present when the server islands feature is used in the targeted application, regardless of what was intended by the component template(s). This issue has been patched in version 5.15.8.

CVE-2025-64764 is a reflected Cross-Site Scripting (XSS) vulnerability classified under CWE-80, affecting the Astro web framework versions prior to 5.15.8. Astro is a modern web framework used to build performant websites and applications, and the vulnerability specifically arises when the server islands feature is utilized. Server islands allow partial hydration of components on the client side, improving performance but introducing complexity in how user input is handled. The vulnerability occurs because the framework improperly neutralizes script-related HTML tags in the generated web pages, allowing attackers to inject malicious JavaScript code via crafted URLs or input parameters that are reflected back in the response. This reflected XSS does not require authentication but does require user interaction, such as clicking a malicious link. The CVSS score of 7.1 (high) reflects the network attack vector, low attack complexity, no privileges required, but user interaction needed, with impacts on confidentiality (data theft) and integrity (session manipulation), though availability is unaffected. No known exploits are reported in the wild yet, but the vulnerability poses a significant risk to applications using vulnerable versions of Astro with server islands enabled. The issue was addressed and patched in version 5.15.8 by improving input sanitization and output encoding to prevent script injection. Organizations using Astro in their web stacks should prioritize upgrading and auditing their use of server islands to mitigate this risk.

Detailed information about CVE-2025-64764: CWE-80: Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) in withastro astro affecting wi

CVE-2025-64764: CWE-80: Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) in withastro astro - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2025-64764: CWE-80: Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) in withastro astro

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