CVE-2026-11717

CVE-2026-11717 details an authentication bypass in googleapis/mcp-toolbox, specifically in the validateOpaqueToken path. When verifying an unparsed opaque token via an OAuth 2.0 introspection endpoint (RFC 7662), the toolbox decodes the response into an introspectResp with Active as a *bool. The ...

EUVD-2026-37879

An authentication bypass vulnerability exists in the generic opaque token validation path validateOpaqueToken of googleapis/mcp-toolbox. When verifying an unparsed opaque token via an OAuth 2.0 introspection endpoint RFC 7662, the toolbox decodes the response into an introspectResp struct where t...

GHSA-76G7-M3XW-X9GR MCP Toolbox for Databases has an Origin Validation Error

The Model Context Protocol has a security warning advising servers to validate the "Origin" header on all incoming connections to prevent DNS rebinding attacks. Prior to the v0.25.0 release, users had no way to validate the origin's host. In v0.25.0, a new "--allowed-hosts" flag was introduced...

Origin Validation Error

Overview Affected versions of this package are vulnerable to Origin Validation Error in the handling of the Origin header on incoming connections. An attacker can bypass access restrictions by exploiting DNS rebinding techniques, potentially gaining unauthorized access to server resources...

Permissive Cross-domain Policy with Untrusted Domains

Overview Affected versions of this package are vulnerable to Permissive Cross-domain Policy with Untrusted Domains in the SSE initialization handler due to the use of a hardcoded Access-Control-Allow-Origin: header. An attacker can gain unauthorized access to sensitive resources by exploiting DNS...