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FluxBB

Fast, light and user-friendly forum application

Forums & Community ★ 544 stars Easy setup GPL-2.0

FluxBB is a fast and lightweight forum application designed to be simpler and quicker than larger forum packages. It focuses on a clean experience for small to medium communities.

Official siteSource code

Key features

  • Very lightweight and fast
  • Clean simple interface
  • Low server requirements
  • Easy to administer

Pros & cons

Strengths

  • Released under the GPL-2.0 license
  • Easy to set up — beginner-friendly
  • Written in PHP
  • Tiny footprint — runs in 128 MB RAM

Trade-offs

  • Minimal feature set
  • Slow development

Is FluxBB secure?

1 known vulnerability affects FluxBB's latest release (fluxbb-1.4.12) according to OSV.dev; the most severe is rated medium.

Affecting fluxbb-1.4.12

AdvisorySeveritySummary
CVE-2021-43677MediumFluxbb v1.4.12 is affected by a Cross Site Scripting (XSS) vulnerability.

Source: OSV.dev, checked 2026-10-14. How this is measured.

FluxBB replaces

Self-hosted phpBB alternatives

Health badge

Maintain FluxBB? Add its health score to your README. The badge links back to this page.

SelfHostIndex: 25 · at risk

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[![SelfHostIndex health score for FluxBB](https://selfhostindex.com/badge/forums-fluxbb.svg)](https://selfhostindex.com/app/forums-fluxbb/)
HTML
<a href="https://selfhostindex.com/app/forums-fluxbb/"><img src="https://selfhostindex.com/badge/forums-fluxbb.svg" alt="SelfHostIndex health score for FluxBB"></a>
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.. image:: https://selfhostindex.com/badge/forums-fluxbb.svg
   :alt: SelfHostIndex health score for FluxBB
   :target: https://selfhostindex.com/app/forums-fluxbb/

The score is recomputed on every nightly rebuild from public repository data — see how it is calculated.

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