Medium severity · published Nov 19, 2025
CVE-2025-64764
Astro is vulnerable to Reflected XSS via the server islands feature
5.4
CVSS
0.5%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 45% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AS
astro · withastro
< 5.15.8 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-64764
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-64764
Patch
https://github.com/withastro/astro/commit/790d9425f39bbbb462f1c27615781cd965009f91
Exploit
https://github.com/withastro/astro/security/advisories/GHSA-wrwg-2hg8-v723
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