Adobe Flash Player versions 26.0.0.137 and earlier have a security bypass vulnerability that leads to information disclosure when performing URL redirect.
https://security.gentoo.org/glsa/201709-16
https://helpx.adobe.com/security/products/flash-player/apsb17-23.html
https://blog.bjornweb.nl/2017/08/flash-remote-sandbox-escape-windows-user-credentials-leak/
https://access.redhat.com/errata/RHSA-2017:2457
http://www.zerodayinitiative.com/advisories/ZDI-17-634/