Vulnerability · Published Nov 13, 2025 · Assigned by GitHub_M

CVE-2025-64745Astro development server error page vulnerable to reflected Cross-site Scripting

Low 2.7

In plain English

A low-severity cross-site scripting in astro from withastro. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 18% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)2.7Low

Exploit odds (30 days)0.3%top 81.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	astro	5.15.6	GHSA-w2vj-39qv-7vh7

Affected products (as reported)

Vendor	Product	Versions
withastro	astro	>= 5.2.0, < 5.15.6

Weakness: CWE-79 · Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:C/C:L/I:N/A:N

References

https://github.com/withastro/astro/security/advisories/GHSA-w2vj-39qv-7vh7 x_refsource_CONFIRM
https://github.com/withastro/astro/pull/12994 x_refsource_MISC
https://github.com/withastro/astro/commit/790d9425f39bbbb462f1c27615781cd965009f91 x_refsource_MISC
https://github.com/withastro/astro/blob/5bc37fd5cade62f753aef66efdf40f982379029a/packages/astro/src/template/4xx.ts#L133-L149 x_refsource_MISC