Medium severity · published Nov 13, 2025
CVE-2025-64745
Astro development server error page vulnerable to reflected Cross-site Scripting
6.1
CVSS
0.3%
EPSS
No
On KEV
Description
Astro is a web framework. Starting in version 5.2.0 and prior to version 5.15.6, a Reflected Cross-Site Scripting (XSS) vulnerability exists in Astro's development server error pages when the `trailingSlash` configuration option is used. An attacker can inject arbitrary JavaScript code that executes in the victim's browser context by crafting a malicious URL. While this vulnerability only affects the development server and not production builds, it could be exploited to compromise developer environments through social engineering or malicious links. Version 5.15.6 fixes the issue.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 18% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AS
astro · withastro
>= 5.2.0, < 5.15.6 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-64745
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-64745
Product
https://github.com/withastro/astro/blob/5bc37fd5cade62f753aef66efdf40f982379029a/packages/astro/src/template/4xx.ts#L133-L149
Patch
https://github.com/withastro/astro/commit/790d9425f39bbbb462f1c27615781cd965009f91
Patch
https://github.com/withastro/astro/pull/12994
Exploit
https://github.com/withastro/astro/security/advisories/GHSA-w2vj-39qv-7vh7
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