Medium severity · published Nov 19, 2025
CVE-2025-65019
Astro is a web framework
6.1
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 20% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AS
Astro · Astro
before 5.15.9 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-65019
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-65019
Patch
https://github.com/withastro/astro/commit/9e9c528191b6f5e06db9daf6ad26b8f68016e533
Exploit
https://github.com/withastro/astro/security/advisories/GHSA-fvmw-cj7j-j39q
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