CVE-2026-54298
Description
Astro is a web framework. Prior to 6.4.6, the spreadAttributes function in Astro's server-side rendering pipeline iterates over object keys and passes them directly to addAttribute, which interpolates the key into the HTML output without escaping. When a developer uses the spread syntax {...props} on an HTML element and the object keys come from an untrusted source (API, CMS, URL parameters), an attacker can inject arbitrary HTML attributes including event handlers like onmousemove, onclick, or break out of the attribute context entirely to inject new elements. This vulnerability is fixed in 6.4.6.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
astronpm | < 6.4.6 | 6.4.6 |
Affected products
2Patches
Vulnerability mechanics
References
3- github.com/withastro/astro/security/advisories/GHSA-jrpj-wcv7-9fh9nvdExploitVendor AdvisoryWEB
- github.com/advisories/GHSA-jrpj-wcv7-9fh9ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-54298ghsaADVISORY
News mentions
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