ikiwiki before 3.20161229 incorrectly called the CGI::FormBuilder->field method (similar to the CGI->param API that led to Bugzilla's CVE-2014-1572), which can be abused to lead to commit metadata forgery.
3.20161229Exploitability
AV:NAC:LPR:NUI:NScope
S:UImpact
C:NI:LA:NCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N