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This release addresses multiple security issues issues and should be applied immediately to all forums running the 2.1 release branch.
Download it now: http://vanillaforums.org/addon/vanilla-core-2.1.13p1
To upgrade to 2.1.13 directly from 2.0.x, add these steps:
Our sincere thanks once again to @mtschirs, whom Vanilla Forums recently worked with on a formal security audit. This update addresses the issues identified during that audit that we prioritized for backport.
We recommend against doing partial upgrades. Never modify core files; put your changes in a plugin or theme. Troubleshooting tips.
The 2.1 branch is in maintenance mode which means it is only receiving security patches until the release of 2.2.