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CVE-2026-9739

UNKNOWN · CVSS N/A EPSS 0.28% Public Exploit

Source: NVD + CISA KEV + EPSS · Published: 2026-05-27 · Last synced: 2026-06-25

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Public Exploit Signal

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

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CVE
CVE-2026-9739
Severity
UNKNOWN
CVSS
N/A
EPSS
0.28%

Original NVD Description

Vulnerable to DNS rebinding attacks when using SSE (http://b/499408790). During the beta phase, we implemented `allowed-origins` and `allowed-hosts` flags to align with MCP security guidelines. However, the hardcoded `Access-Control-Allow-Origin: *` header in the SSE initialization handler was inadvertently retained. This vulnerability specifically impacts users connecting via Toolbox using SSE under specification v2024-11-05.