What’s Vulnerable › Vulnerabilities

CVE-2025-65019: Astro Cloudflare adapter has a Stored Cross Site Scripting vulnerability in /_image endpoint

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2025-11-19 · updated 2026-10-18
• Weakness: CWE-79

Description

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.

Affected products

• withastro astro: before 5.15.9 — fixed in 5.15.9

How to fix

Upgrade to a fixed version: withastro astro 5.15.9. Check the vendor advisory for mitigations.

References

• https://github.com/withastro/astro/commit/9e9c528191b6f5e06db9daf6ad26b8f68016e533
• https://github.com/withastro/astro/security/advisories/GHSA-fvmw-cj7j-j39q

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