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TI-2026-32882 Aliases CVE-2026-45028GHSA-xr5h-phrj-8vxv

Astro: Server island encrypted parameters vulnerable to cross-component replay

Priority LOW 19CWE-323Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
Present
Impact type
Cross-site scripting
Confidentiality · integrity · availability
None · Low · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-79.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00144 3rd percentileScored 2026-11-07
Fix Fixed astro (withastro): 6.1.10astro (npm): 6.1.10

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
withastroastrobefore 6.1.106.1.10Patch availableCNA
—astro (npm)before 6.1.106.1.10Patch availableGHSA-xr5h-phrj-8vxv
  • astro Vendorwithastro Affected before 6.1.10 Fixed in 6.1.10 Patch available CNA
  • astro (npm) Vendor— Affected before 6.1.10 Fixed in 6.1.10 Patch available GHSA-xr5h-phrj-8vxv

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:astro:astro:*:*:*:*:*:node.js:*:*before 6.1.10Vulnerablewithastro
  • cpe:2.3:a:astro:astro:*:*:*:*:*:node.js:*:* Versions before 6.1.10 Vulnerable ·withastro

Remediation

  • Fix · CNA astro (withastro) Fixed in 6.1.10
  • Fix · GHSA-xr5h-phrj-8vxv astro (npm) Fixed in 6.1.10 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-45028
  2. 2026-10-03 Alias added: GHSA-xr5h-phrj-8vxv

References

Patch 2

Advisory 2

Other 1

  • TI-2024-37142 Server source code is exposed to the public if sourcemaps are enabled CVSS 4.0HIGH 7.8
  • TI-2025-34958 Unauthorized third-party images in Astro’s _image endpoint CVSS 4.0MEDIUM 6.9
  • TI-2025-39915 Server-side request forgery in withastro astro CVSS 3.1MEDIUM 6.5
  • TI-2025-38274 Astro's `X-Forwarded-Host` is reflected with no validation CVSS 3.1MEDIUM 6.5
  • TI-2026-36915 Astro: Reflected XSS via unescaped slot name CVSS 3.1HIGH 7.1
  • TI-2025-40102 Astro is vulnerable to Reflected XSS via the server islands feature CVSS 3.1HIGH 7.1
See all 19 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences