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CVE-2026-46431

MEDIUM · CVSS 4.3 EPSS 0.22% Public Exploit

Source: NVD + CISA KEV + EPSS · Published: 2026-05-26 · Last synced: 2026-06-25

CyberRota Analysis

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Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

GitHub PoC Links
github.com ↗

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-46431
Severity
MEDIUM
CVSS
4.3
EPSS
0.22%
Java

Original NVD 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.