Threats Tagged 'cve-2026-81315'
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Threats Tagged 'cve-2026-81315'
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CVE-2026-81315: CWE-346 Origin Validation Error in ash-project ash_aiCVE-2026-81315 0 Origin Validation Error vulnerability in ash-project ash_ai allows a malicious web page to bypass the MCP server's DNS-rebinding protection and issue cross-site requests to a user's local MCP server with that user's actor. In AshAi.Mcp.Server, with the default allowed_origins: nil, origin_allowed?/3 accepts an origin when uri.host == conn.host and the forwarded scheme is https. Both values are attacker-controlled: conn.host comes from the Host header and the scheme is read from the raw x-forwarded-proto header with no trusted-proxy check. Under DNS rebinding the browser sends the attacker's origin and a matching host, and page JavaScript may set X-Forwarded-Proto: https, so the check passes with no TLS or proxy involved. The fix trusts only localhost origins by default; other origins require an explicit allowed_origins allowlist. This issue affects ash_ai: from 0.8.0 before 1.0.0. Join the discussion | CVE Database V5 | 08/31/2026, 00:57:55 UTC Added: 08/31/2026, 01:07:39 UTC |
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