CVE-2025-55303
6.1 · MEDIUMOverview
CVE-2025-55303 is a medium-severity vulnerability affecting astro astro. It was published on August 19, 2025 and has a CVSS 3.1 base score of 6.1 (MEDIUM).
This vulnerability has a CVSS 3.1 base score of 6.1, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical Description
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.
Remediation
Check the references section for vendor advisories and patches from astro. Update astro to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| astro | astro | >= 0, < 4.16.18 | Affected |
Frequently Asked Questions
What is CVE-2025-55303?
CVE-2025-55303 is a medium-severity vulnerability affecting astro astro. It was published on August 19, 2025 and has a CVSS 3.1 base score of 6.1 (MEDIUM).
How severe is CVE-2025-55303?
This vulnerability has a CVSS 3.1 base score of 6.1, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2025-55303?
Check the references section for vendor advisories and patches from astro. Update astro to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2025-55303?
CyberStrike's AI-powered security agents can automatically detect CVE-2025-55303 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
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