XSS in 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 been patched in version 5.15.8.
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.005 (41.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 41st percentile — 41.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
- Astro
- Withastro Astro — versions < 5.15.8
Weakness classification (CWE)
References
- github.com/withastro/astro/security/advisories/GHSA-wrwg-2hg8-v723 (Exploit, Vendor Advisory)
- github.com/withastro/astro/commit/790d9425f39bbbb462f1c27615781cd965009f91 (Patch)
Frequently asked questions
- What is CVE-2025-64764?
- CVE-2025-64764 is a high-severity vulnerability in 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.