# CVE-2026-59727

## Summary

- **CVE ID:** CVE-2026-59727
- **Severity:** LOW
- **CVSS Score:** 2.1 (CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N)
- **CWE:** CWE-79, CWE-83, CWE-116
- **Published:** Jul 27, 2026
- **Last Modified:** Jul 28, 2026

## Description

Astro is a web framework for content-driven websites. In versions 3.10.0 through 7.0.3, when a transition:persist, transition:scope, or transition:persist-props directive is applied to a client-hydrated (client:*) component, Astro copied the directive value onto the rendered <astro-island> element without HTML-escaping it. If a developer reflects attacker-controlled input into one of these directives, an attacker can break out of the attribute and inject arbitrary HTML/JavaScript into the server-rendered output, resulting in reflected cross-site scripting (XSS). Exploitation requires the application developer to have written a non-idiomatic pattern — passing untrusted, request-derived input directly into a transition directive. Astro applications that do not route untrusted input into these directives are unaffected. This issue has been fixed in version 7.0.4.

## Affected Products

- withastro — astro (>= 3.10.0, < 7.0.4)

## References

- [CNA](https://github.com/withastro/astro/security/advisories/GHSA-7pw4-f3q4-r2p2)
- [CNA](https://github.com/withastro/astro/pull/17212)
- [CNA](https://github.com/withastro/astro/commit/7ba0bb1dc7516e88caff9abd7767322af44b0294)
- [CNA](https://github.com/withastro/astro/releases/tag/astro@7.0.4)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.31%
- **EPSS Percentile:** 23.6

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._