Guzzle is an open source PHP HTTP client. In affected versions Authorization
headers on requests are sensitive information. On making a request using the https
scheme to a server which responds with a redirect to a URI with the http
scheme, we should not forward the Authorization
header on. This is much the same as to how we don't forward on the header if the host changes. Prior to this fix, https
to http
downgrades did not result in the Authorization
header being removed, only changes to the host. Affected Guzzle 7 users should upgrade to Guzzle 7.4.4 as soon as possible. Affected users using any earlier series of Guzzle should upgrade to Guzzle 6.5.7 or 7.4.4. Users unable to upgrade may consider an alternative approach which would be to use their own redirect middleware. Alternately users may simply disable redirects all together if redirects are not expected or required.