Astro is a web framework for content-driven websites. In versions of astro before 5.13.2 and 4.16.18, 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. This vulnerability is fixed in 5.13.2 and 4.16.18.
| Package (Ecosystem) | Introduced | Fixed | Limit |
|---|---|---|---|
| astro(npm) | 5.0.0-alpha.0 | 5.13.2 | N/A |
| @astrojs/node(npm) | 0 | 9.1.1 | N/A |
| astro(npm) | 0 | 4.16.19 | N/A |
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