follow-redirects is an open source, drop-in replacement for Node's http and https modules that automatically follows redirects. Prior to 1.16.0, when an HTTP request follows a cross-domain redirect (301/302/307/308), follow-redirects only strips authorization, proxy-authorization, and cookie headers (matched by regex at index.js). Any custom authentication header (e.g., X-API-Key, X-Auth-Token, Api-Key, Token) is forwarded verbatim to the redirect target. This vulnerability is fixed in 1.16.0.

follow-redirects is an open source, drop-in replacement for Node's http and https modules that automatically follows redirects. In affected versions follow-redirects only clears authorization header during cross-domain redirect, but keep the proxy-authentication header which contains credentials too. This vulnerability may lead to credentials leak, but has been addressed in version 1.15.6. Users are advised to upgrade. There are no known workarounds for this vulnerability.

A flaw was found in the follow-redirects package. This flaw allows the exposure of sensitive information to an unauthorized actor due to the usage of insecure HTTP protocol. This issue happens with an Authorization header leak from the same hostname, https-http, and requires a Man-in-the-Middle (MITM) attack.

A flaw was found in follow-redirects when fetching a remote URL with a cookie when it gets to the Location response header. This flaw allows an attacker to hijack the account as the cookie is leaked.