Astro Cloudflare adapter has a Stored Cross Site Scripting vulnerability in /_image endpoint

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.

Scores

EPSS (exploitation in 30 days)

0.27% · top 80% of all CVEs (6 Nov 2026)

CISA SSVC

Exploitation: poc · Automatable: no · Technical impact: partial

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.4.

Weakness

• CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (opens in a new tab)All about CWE-79 and its CVEs

Affected products

• withastro · astro

  • affected < 5.15.9

Affected packages

From reviewed advisories of the GitHub Advisory Database.

• npmastroGHSA-fvmw-cj7j-j39q (opens in a new tab)

References (2)

• https://github.com/withastro/astro/security/advisories/GHSA-fvmw-cj7j-j39q (opens in a new tab)x_refsource_CONFIRM
• https://github.com/withastro/astro/commit/9e9c528191b6f5e06db9daf6ad26b8f68016e533 (opens in a new tab)x_refsource_MISC

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisory GHSA-fvmw-cj7j-j39q (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2025-65019](https://trackcve.app/badge/CVE-2025-65019.svg)](https://trackcve.app/cve/CVE-2025-65019)

Record last updated 19 Nov 2025, 21:05 UTC.