CVE-2026-49857

auth-fetch-mcp is an MCP server that lets AI assistants fetch content from authenticated web pages. Version 3.0.1 implements SSRF protection in assertSafeUrl src/security.ts to block requests to private and loopback addresses. However, the isPrivateV6 function fails to detect IPv4-mapped IPv6...

CVE-2026-49857 auth-fetch-mcp has SSRF Protection Bypass via IPv4-mapped IPv6 Loopback

auth-fetch-mcp is an MCP server that lets AI assistants fetch content from authenticated web pages. Version 3.0.1 implements SSRF protection in assertSafeUrl src/security.ts to block requests to private and loopback addresses. However, the isPrivateV6 function fails to detect IPv4-mapped IPv6...

EUVD-2026-58054

auth-fetch-mcp is an MCP server that lets AI assistants fetch content from authenticated web pages. Version 3.0.1 implements SSRF protection in assertSafeUrl src/security.ts to block requests to private and loopback addresses. However, the isPrivateV6 function fails to detect IPv4-mapped IPv6...

CVE-2026-49857

auth-fetch-mcp has an SSRF protection bypass via IPv4-mapped IPv6 loopback. The root cause is in isPrivateV6() handling of hex-normalized IPv4-mapped addresses; input like http://[::ffff:127.0.0.1]:PORT/ becomes http://[::ffff:7f00:1]:PORT/ and net.isIPv4 returns false, allowing requests to priva...

CVE-2026-49857 auth-fetch-mcp has SSRF Protection Bypass via IPv4-mapped IPv6 Loopback

auth-fetch-mcp is an MCP server that lets AI assistants fetch content from authenticated web pages. Version 3.0.1 implements SSRF protection in assertSafeUrl src/security.ts to block requests to private and loopback addresses. However, the isPrivateV6 function fails to detect IPv4-mapped IPv6...

CVE-2026-49857

auth-fetch-mcp is an MCP server that lets AI assistants fetch content from authenticated web pages. Version 3.0.1 implements SSRF protection in assertSafeUrl src/security.ts to block requests to private and loopback addresses. However, the isPrivateV6 function fails to detect IPv4-mapped IPv6...

auth-fetch-mcp has SSRF Protection Bypass via IPv4-mapped IPv6 Loopback

SSRF Protection Bypass via IPv4-mapped IPv6 Loopback Summary auth-fetch-mcp v3.0.1 implements SSRF protection in assertSafeUrl src/security.ts to block requests to private and loopback addresses. However, the isPrivateV6 function fails to detect IPv4-mapped IPv6 loopback addresses in their...

NPM: auth-fetch-mcp has SSRF Protection Bypass via IPv4-mapped IPv6 Loopback

NPM: auth-fetch-mcp has SSRF Protection Bypass via IPv4-mapped IPv6 Loopback vulnerability discovered by ? in WordPress Npm auth-fetch-mcp versions = 3.0.1...

Server-side Request Forgery (SSRF)

Overview auth-fetch-mcp is a MCP server that lets AI read Notion, Google Docs, Jira & any login-protected page via a real browser Affected versions of this package are vulnerable to Server-side Request Forgery SSRF in the isPrivateV6 function, which fails to properly detect IPv4-mapped IPv6...

GHSA-HV85-774V-26FG auth-fetch-mcp: SSRF and disk exfiltration via unvalidated auth_fetch and download_media URLs

SSRF + disk-exfil in downloadmedia and authfetch tools — ymw0407/auth-fetch-mcp Severity The downloadmedia and authfetch MCP tools accept arbitrary URLs and reach them as the MCP server process, with downloadmedia additionally persisting the fetched response body to a user-controlled output...

NPM: auth-fetch-mcp: SSRF and disk exfiltration via unvalidated auth_fetch and download_media URLs

NPM: auth-fetch-mcp: SSRF and disk exfiltration via unvalidated authfetch and downloadmedia URLs vulnerability discovered by ? in WordPress Npm auth-fetch-mcp versions = 3.0.0...

auth-fetch-mcp: SSRF and disk exfiltration via unvalidated auth_fetch and download_media URLs

SSRF + disk-exfil in downloadmedia and authfetch tools — ymw0407/auth-fetch-mcp Severity The downloadmedia and authfetch MCP tools accept arbitrary URLs and reach them as the MCP server process, with downloadmedia additionally persisting the fetched response body to a user-controlled output...