CVE-2026-45028
Astro: Server island encrypted parameters vulnerable to cross-component replay
Impact
Astro is a web framework. Astro versions prior to 6.1.10 used AES-GCM encryption to protect the confidentiality and integrity of server island props and slots parameters, but did not bind the ciphertext to its intended component or parameter type. An attacker could replay one component's encrypted props (p) value as another component's slots (s) value, or vice versa. Since slots contain raw unescaped HTML while props may contain user-controlled values, this could lead to XSS in applications. This occurs when the application uses server islands, two different server island components share the same key name for a prop and a slot, and an attacker has full control over the value of the overlapping prop (requires a dynamically rendered page). This vulnerability is fixed in 6.1.10.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | astro | < 6.1.10 | 6.1.10 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Astro | Astro | before 6.1.10 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-xr5h-phrj-8vxv
- https://github.com/withastro/astro/security/advisories/GHSA-xr5h-phrj-8vxv
- https://github.com/withastro/astro/pull/16457
- https://github.com/withastro/astro/commit/3d82220a1549e699e34ed433f3846a919f4c02bd
- https://nvd.nist.gov/vuln/detail/CVE-2026-45028