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TI-2025-40083 Aliases CVE-2025-64745GHSA-w2vj-39qv-7vh7

Astro development server error page vulnerable to reflected Cross-site Scripting

Priority MEDIUM 60CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
Low · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-79.

Summary

Astro is a web framework. Starting in version 5.2.0 and prior to version 5.15.6, a Reflected Cross-Site Scripting (XSS) vulnerability exists in Astro's development server error pages when the `trailingSlash` configuration option is used. An attacker can inject arbitrary JavaScript code that executes in the victim's browser context by crafting a malicious URL. While this vulnerability only affects the development server and not production builds, it could be exploited to compromise developer environments through social engineering or malicious links. Version 5.15.6 fixes the issue.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00262 18th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed astro (withastro): 5.15.6astro (npm): 5.15.6

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
withastroastro5.2.0 to before 5.15.65.15.6Patch availableCNA
—astro (npm)5.2.0 to before 5.15.65.15.6Patch availableGHSA-w2vj-39qv-7vh7
  • astro Vendorwithastro Affected 5.2.0 to before 5.15.6 Fixed in 5.15.6 Patch available CNA
  • astro (npm) Vendor— Affected 5.2.0 to before 5.15.6 Fixed in 5.15.6 Patch available GHSA-w2vj-39qv-7vh7

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:astro:astro:*:*:*:*:*:node.js:*:*5.2.0 to before 5.15.6Vulnerablewithastro
  • cpe:2.3:a:astro:astro:*:*:*:*:*:node.js:*:* Versions 5.2.0 to before 5.15.6 Vulnerable ·withastro

Remediation

  • Fix · CNA astro (withastro) Fixed in 5.15.6
  • Fix · GHSA-w2vj-39qv-7vh7 astro (npm) Fixed in 5.15.6 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-64745
  2. 2026-10-03 Alias added: GHSA-w2vj-39qv-7vh7

References

Exploit 1

Patch 2

Advisory 1

Other 2

  • TI-2024-37142 Server source code is exposed to the public if sourcemaps are enabled CVSS 4.0HIGH 7.8
  • TI-2025-34958 Unauthorized third-party images in Astro’s _image endpoint CVSS 4.0MEDIUM 6.9
  • TI-2025-39915 Server-side request forgery in withastro astro CVSS 3.1MEDIUM 6.5
  • TI-2025-38274 Astro's `X-Forwarded-Host` is reflected with no validation CVSS 3.1MEDIUM 6.5
  • TI-2026-36915 Astro: Reflected XSS via unescaped slot name CVSS 3.1HIGH 7.1
  • TI-2025-40102 Astro is vulnerable to Reflected XSS via the server islands feature CVSS 3.1HIGH 7.1
See all 19 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences