A Session Fixation issue exists in CodeIgniter before 3.1.10 because session.use_strict_mode in the Session Library was mishandled.
- https://nvd.nist.gov/vuln/detail/CVE-2018-12071
- https://github.com/bcit-ci/CodeIgniter/issues/5958
- https://web.archive.org/web/20181115214804/https://www.codeigniter.com/user_guide/changelog.html#version-3-1-9
- https://github.com/bcit-ci/CodeIgniter/commit/800a20d6c4662d99ae0988b2f8f2238bb8bb29db
- https://www.codeigniter.com/user_guide/changelog.html
- https://github.com/bcit-ci/CodeIgniter/commit/a9da3dd2f16a8f97d7bc4ff5572b28e4bb84c813#diff-32788a4d3748e8818044886ab43241179c7f5f5b82e979e73146669ca6e2da1cR306
- https://github.com/advisories/GHSA-g434-3q2j-hj4r