PT-2025-47490 · Astro · @Astrojs/Cloudflare+1

Published 2025-11-19 · Updated 2025-11-27 · CVE-2025-65019

Positive Technologies (AI Summary)

CVSS v3.1

6.1

Medium

Base vector

AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Name of the Vulnerable Software and Affected Versions Astro versions prior to 5.15.9

Description Astro, a web framework, has an issue when using the Cloudflare adapter (@astrojs/cloudflare) with output set to 'server'. The image optimization endpoint ('/ image') includes a flaw in the isRemoteAllowed() function. This function incorrectly allows data: protocol URLs, which can be exploited to launch Cross-Site Scripting (XSS) attacks using malicious SVG payloads. This bypasses domain restrictions and Content Security Policy protections.

Recommendations Update to version 5.15.9 or later.

Exploit

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2025-65019

GHSA-FVMW-CJ7J-J39Q

Affected Products

@Astrojs/Cloudflare

Astro

References · 10

• 🔥 https://github.com/withastro/astro/security/advisories/GHSA-fvmw-cj7j-j39q · Exploit
• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/65xxx/CVE-2025-65019.json · Exploit
• https://github.com/withastro/astro/commit/9e9c528191b6f5e06db9daf6ad26b8f68016e533 · Patch
• https://osv.dev/vulnerability/GHSA-fvmw-cj7j-j39q · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2025-65019 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-65019 · Security Note
• https://github.com/withastro/astro · Note
• https://twitter.com/zomasec/status/1994106718251569427 · Twitter Post
• https://t.me/CVEtracker/37753 · Telegram Post
• https://twitter.com/CVEnew/status/1991187279419994306 · Twitter Post