What is the CVSS score of CVE-2025-64764?

CVE-2025-64764 has a CVSS 3.1 base score of 7.1 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:N. EPSS exploitation probability: 0.5%.

Which versions of Astro are affected by CVE-2025-64764?

Organizations using Astro face moderate risk from CVE-2025-64764 rated CVSS 7.1. Exploitation could compromise the security of affected deployments.. A patch is available.

Is there a public PoC exploit available for CVE-2025-64764?

Yes, a public proof-of-concept exploit is available for CVE-2025-64764. Prioritise patching immediately. EPSS: 0.5%.

How to fix or mitigate CVE-2025-64764?

Within 30 days: Identify all affected systems and apply vendor patches as part of regular patch cycle. Vendor patch is available.

Astro CVE-2025-64764

HIGH

Basic XSS (CWE-80)

2025-11-19 security-advisories@github.com

XSS Astro

7.1

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

7.1 HIGH

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

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

Low

Integrity

High

Availability

None

Lifecycle Timeline

Analysis Generated

Mar 28, 2026 - 19:23 vuln.today

Patch released

Mar 28, 2026 - 19:23 nvd

Patch available

PoC Detected

Nov 20, 2025 - 17:54 vuln.today

Public exploit code

CVE Published

Nov 19, 2025 - 17:15 nvd

HIGH 7.1

DescriptionGitHub Advisory

Astro is a web framework. Prior to version 5.15.8, a reflected XSS vulnerability is present when the server islands feature is used in the targeted application, regardless of what was intended by the component template(s). This issue has been patched in version 5.15.8.

AnalysisAI

Astro is a web framework. Rated high severity (CVSS 7.1), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available.

Technical ContextAI

This vulnerability is classified under CWE-80. Astro is a web framework. Prior to version 5.15.8, a reflected XSS vulnerability is present when the server islands feature is used in the targeted application, regardless of what was intended by the component template(s). This issue has been patched in version 5.15.8. Affected products include: Astro. Version information: version 5.15.8.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.