CVE-2025-65019 Astro Cloudflare adapter has a Stored Cross Site Scripting vulnerability in /_image endpoint
Attackers can execute arbitrary JavaScript via malicious SVG payloads in the image endpoint, bypassing CSP and domain restrictions in server-mode Astro apps.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2025-65019?
CVE-2025-65019 is a medium-severity cross-site scripting vulnerability in withastro astro, published on 19 Nov 2025. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-79
Which versions are affected by CVE-2025-65019?
2 open source packages ship an affected version, including astro. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
astro npm | All versions | 5.15.9 |
astro npm | All versions | 5.15.9 |
Products include Astro Astro.
How do I fix CVE-2025-65019?
Upgrade astro to 5.15.9 or later.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2025-65019 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-65019 exists.
Other vulnerabilities in withastro astro
- CVE-2024-56159 Server source code is exposed to the public if sourcemaps are enabled
- CVE-2026-54299 Astro: Host header SSRF in prerendered error page fetch
- CVE-2025-59837 astro allows bypass of image proxy domain validation leading to SSRF and potential XSS
- CVE-2026-50146 Astro: Reflected XSS via unescaped slot name
- CVE-2025-64764 Astro is vulnerable to Reflected XSS via the server islands feature
Sources
Also known as GHSA-fvmw-cj7j-j39q.