FluxBB is fast, light, user-friendly forum software for your website.

FluxBB is designed as a lighter, faster alternative to some of the traditional feature heavy forum applications. It is easy to use and has a proven track record of stability and security making it an ideal choice of forum for your website.


  • Supports PHP4 & PHP5
  • Easy installation and setup
  • Open-source (GNU General Public Licence)
  • Clean admin interface
  • Flexible permission system
  • Lots of community modifications

[ Full feature list ] [ Tour of FluxBB v1.5.9 ]

Get FluxBB

The current stable release is FluxBB v1.5.9.

Posted 2015-11-09FluxBB 1.5.9 released

Today marks the release of version 1.5.9 of the FluxBB forum software.

Due to two security-relevant bug fixes, this release only contains bug fixes. Improvements that were originally planned to be released with this version, like SQLite3 support and a responsive design, will be delayed to a soon-to-be-released v1.5.10.

Security fixes

This release fixes two security issues: The first one allowed attackers to trick moderators into e.g. locking or stickying other topics without noticing. The second change prevents sophisticated timing attacks targeted at e.g. password hashes.

More bugfixes

Other changes in this release include several fixes of regressions introduced in the last release, fixes related to the handling of several esoteric HTTP headers, and a fix for a quote bug that broke the forum layout. Finally, if you want to embed your forum in another web page, the relevant HTTP header is now configurable.


Please update your forums as soon as possible.

As always, download packages can be found on our download page.
Changed files and patches are available on the upgrade page. Please remember to make a backup of your files as well as the database before upgrading your forum!

Thank you to everyone involved in this release, from vulnerability reports to bug fixes.

Flarum progress

In case you haven't followed its progress, Flarum is progressing nicely and is currently moving through regular beta releases. Go check it out on Flarum.org.