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    GHSA-5p9g-j988-pcwv (mcp): Ruby SSE Session Poisoning

    GHSA-5p9g-j988-pcwv (mcp): Ruby SSE Session Poisoning

    21-Jul-2026 1
    Originally appeared on RubySec.## Summary Vulnerability: Missing Session Ownership Validation in the Ruby MCP SDK's Streamable and SSE HTTP transport implementation. Any attacker with a stolen session ID can execute tools with the victim's session. This is a silent attack - th...
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