CVE-2017-18026

Redmine before 3.2.9, 3.3.x before 3.3.6, and 3.4.x before 3.4.4 does not block the –config and –debugger flags to the Mercurial hg program, which allows remote attackers to execute arbitrary commands (through the Mercurial adapter) via vectors involving a branch whose name begins with a –config= or –debugger= substring, a related issue to CVE-2017-17536.

Source: CVE-2017-18026