GHSA-9X76-MP7R-2XC5 MantisBT vulnerable to CSRF and Open Redirect attacks

MantisBT before 1.3.11, 2.x before 2.3.3, and 2.4.x before 2.4.1 omits a backslash check in stringapi.php and consequently has conflicting interpretations of an initial / substring as introducing either a local pathname or a remote hostname, which leads to 1 arbitrary Permalink Injection via CSRF...