Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE-2025-55303
Summary
Astro is a web framework for content-driven websites. In versions of astro through 4.16.18, 5.0.0 through 5.13.1 and astrojs/node through 9.4.1 , the image optimization endpoint in projects deployed with on-demand rendering allows images from unauthorized third-party domains to be served. On-demand rendered sites built with Astro include an "/_image" endpoint which returns optimized versions of images. A bug in impacted versions of astro allows an attacker to bypass the third-party domain restrictions by using a protocol-relative URL as the image source, e.g. "/_image?href=//example.com/image.png".
- LOW
- NETWORK
- LOW
- CHANGED
- REQUIRED
- NONE
- LOW
- NONE
CWE-79 - Cross Site Scripting
Cross-Site Scripting, commonly referred to as XSS, is the most dominant class of vulnerabilities. It allows an attacker to inject malicious code into a pregnable web application and victimize its users. The exploitation of such a weakness can cause severe issues such as account takeover, and sensitive data exfiltration. Because of the prevalence of XSS vulnerabilities and their high rate of exploitation, it has remained in the OWASP top 10 vulnerabilities for years.
References
Advisory Timeline
- Published
