CVE-2026-45028
published 2026-05-13CVE-2026-45028: 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…
PriorityP429medium6.1CVSS 3.1
AVNACLPRNUIRSCCLILAN
EPSS
0.14%
4.0th percentile
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
3 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| astro | astro | < 6.1.10 | 6.1.10 |
| astro | astro | >= 0 < 6.1.10 | 6.1.10 |
| withastro | astro | < 6.1.10 | 6.1.10 |
CVSS provenance
nvdv3.16.1MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
nvdv4.02.9LOWCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
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VulDB
withastro up to 6.1.9 nonce re-use (GHSA-xr5h-phrj-8vxv)
vuldb·2026-05-13·CVSS 2.9
CVE-2026-45028 [LOW] withastro up to 6.1.9 nonce re-use (GHSA-xr5h-phrj-8vxv)
A vulnerability categorized as problematic has been discovered in withastro astro up to 6.1.9. The affected element is an unknown function. Such manipulation leads to reusing a nonce.
This vulnerability is traded as CVE-2026-45028. The attack may be launched remotely. There is no exploit available.
It is advisable to upgrade the affected component.
GHSA
Astro: Server island encrypted parameters vulnerable to cross-component replay
ghsa·2026-05-13
CVE-2026-45028 [LOW] CWE-323 Astro: Server island encrypted parameters vulnerable to cross-component replay
Astro: Server island encrypted parameters vulnerable to cross-component replay
### Impact
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 that meet **all** of the following conditions:
- The application uses server islands
- Two different server island components share the same key name for a prop and a slot
- An attacker has full control over the value of the overlap
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
2026-05-13
Published