CVE-2026-46431— Algernon: Auto-refresh SSE event server sets Access-Control-Allow-Origin: *
Possible ATT&CK Techniques 1AI
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I. Basic Information for CVE-2026-46431
Vulnerability Information
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Vulnerability Title
Algernon: Auto-refresh SSE event server sets Access-Control-Allow-Origin: *
Source: NVD (National Vulnerability Database)
Vulnerability Description
Algernon is a small self-contained pure-Go web server. Prior to 1.17.7, the SSE event server's Access-Control-Allow-Origin response header was hardcoded to the wildcard * regardless of the caller's Origin. Because EventSource does not preflight and does not send cookies, the wildcard is sufficient to let any third-party page the developer visits open a cross-origin EventSource to the SSE port and read the live filename stream from JavaScript. This vulnerability is fixed in 1.17.7.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
过度许可的跨域白名单
Source: NVD (National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-46431
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-46431 (1)
Same Patch Batch · xyproto · 2026-05-26 · 7 CVEs total
| CVE-2026-45721 | 9.0 CRITICAL | Algernon: handler.lua discovery walks parent directories above the server root |
| CVE-2026-48126 | 8.2 HIGH | Algernon: Host header path traversal in --domain mode reads files and runs Lua from parent |
| CVE-2026-45728 | 7.5 HIGH | Algernon: Single-file mode unconditionally enables debug mode |
| CVE-2026-46430 | 4.3 MEDIUM | Algernon: Auto-refresh SSE event server binds to all interfaces by default on Linux/macOS |
| CVE-2026-43981 | Algernon: Race Condition in handle() shared LState | |
| CVE-2026-43982 | Algernon: Path traversal file write via savein() |
IV. Related Vulnerabilities
Same product: algernon
- CVE-2026-48126
Algernon: Host header path traversal in --domain mode reads - CVE-2026-46430
Algernon: Auto-refresh SSE event server binds to all interfa - CVE-2026-45728
Algernon: Single-file mode unconditionally enables debug mod - CVE-2026-45721
Algernon: handler.lua discovery walks parent directories abo - CVE-2026-43981
Algernon: Race Condition in handle() shared LState
Same vendor: xyproto
- CVE-2026-48126
Algernon: Host header path traversal in --domain mode reads - CVE-2026-46430
Algernon: Auto-refresh SSE event server binds to all interfa - CVE-2026-45728
Algernon: Single-file mode unconditionally enables debug mod - CVE-2026-45721
Algernon: handler.lua discovery walks parent directories abo - CVE-2026-43981
Algernon: Race Condition in handle() shared LState
Same weakness: CWE-942
- CVE-2026-7643
ChatGPTNextWeb NextChat API Endpoint Next.js cross-domain po - CVE-2026-7581
alexta69 MeTube CORS Policy main.py on_prepare cross-domain - CVE-2026-41056
AVideos has CORS Origin Reflection with Credentials on Sensi - CVE-2026-6662
ericc-ch copilot-api Token Endpoint server.ts cors cross-dom - CVE-2026-6143
farion1231 cc-switch ProxyServer server.rs cross-domain poli
V. Comments for CVE-2026-46431
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