What is CVE-2025-64764?

CVE-2025-64764 is a high-severity vulnerability in Withastro Astro, classified under Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS). CVSS score: 7.1/10. Published 2025-11-19.

How severe is CVE-2025-64764?

High severity. CVSS v3 base score is 7.1 out of 10.

XSS in Withastro Astro

CVE-2025-64764

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 b…

EPSS: 0.002 (47.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:N.

Affected products

Withastro Astro — versions < 5.15.8

Weakness classification (CWE)

CWE-80 — Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)

References

https://github.com/withastro/astro/security/advisories/GHSA-wrwg-2hg8-v723 (x_refsource_CONFIRM)
https://github.com/withastro/astro/commit/790d9425f39bbbb462f1c27615781cd965009f91 (x_refsource_MISC)

Frequently asked questions

What is CVE-2025-64764?: CVE-2025-64764 is a high-severity vulnerability in Withastro Astro, classified under Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS). CVSS score: 7.1/10. Published 2025-11-19.
How severe is CVE-2025-64764?: High severity. CVSS v3 base score is 7.1 out of 10.