CVE-2025-64764

Astro is vulnerable to Reflected XSS via the server islands feature

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

withastro · astro

CVSS v3.1 NVD

5.4 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

CVSS v3.1 GITHUB

7.1 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:N

EPSS

0.49% chance of exploitation in the next 30 days, 41st percentile

Nuclei

high

Published

2025-11-19

Nuclei templates (1)

• projectdiscovery/nuclei-templates/blob/main/http/cves/2025/CVE-2025-64764.yaml

Security advisories

• withastro/astro/security/advisories/GHSA-wrwg-2hg8-v723
• advisories/GHSA-wrwg-2hg8-v723
• withastro/astro/commit/790d9425f39bbbb462f1c27615781cd965009f91

References

• CVE Record
• NVD entry