PYSEC-2026-1617 Model Context Protocol (MCP) Python SDK does not enable DNS rebinding protection by default

Description The Model Context Protocol MCP Python SDK does not enable DNS rebinding protection by default for HTTP-based servers. When an HTTP-based MCP server is run on localhost without authentication using FastMCP with streamable HTTP or SSE transport, and has not configured...

CVE-2025-15104 Nu Html Checker (validator.nu) - Restriction bypass vulnerability allowing local SSRF

Nu Html Checker validator.nu contains a restriction bypass that allows remote attackers to make the server perform arbitrary HTTP/HTTPS requests to internal resources, including localhost services. While the validator implements hostname-based protections to block direct access to localhost and...

1Panel IP Access Control Bypass via Untrusted X-Forwarded-For Headers

Summary The server trusts all reverse-proxy headers by default, so any remote client can spoof X-Forwarded-For to bypass IP-based protections AllowIPs, API IP whitelist, “localhost-only” checks. All IP-based access control becomes ineffective. Details - Gin is created with defaults gin.Default,...

CVE-2018-6671

Application Protection Bypass vulnerability in McAfee ePolicy Orchestrator ePO 5.3.0 through 5.3.3 and 5.9.0 through 5.9.1 allows remote authenticated users to bypass localhost only access security protection for some ePO features via a specially crafted HTTP request...