CVE-2016-9646 Commit metadata forgery via CGI::FormBuilder context-dependent APIs

What is CVE-2016-9646?

CVE-2016-9646 is a medium-severity missing authorization vulnerability in Debian Debian Linux, published on 13 Apr 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

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.

Weakness: CWE-287

Which versions are affected by CVE-2016-9646?

It affects 2 products.

Products include Debian Debian Linux, Ikiwiki Ikiwiki.

How do I fix CVE-2016-9646?

Upgrade to a fixed version.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2016-9646 being exploited?

There is no known exploitation of CVE-2016-9646 in the wild and no public exploit code.

Other vulnerabilities in Debian Debian Linux

• CVE-2015-3306 ProFTPD Improper Access Control Exploited Critical 10.0
• CVE-2025-49113 RoundCube Webmail Deserialization of Untrusted Data Exploited Critical 9.9
• CVE-2026-24061 GNU InetUtils Argument Injection Exploited Critical 9.8
• CVE-2025-39682 Linux Kernel Improper Check for Unusual or Exceptional Conditions Exploited Critical 9.8
• CVE-2024-9680 Mozilla Firefox Use-After-Free Exploited Critical 9.8

All Debian Debian Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2016-9646, GHSA-fvvm-x83v-fc5r, UBUNTU-CVE-2016-9646.