# Firefly III v6.6.2

- Product: Firefly III (https://whatsnew.fyi/product/firefly-iii)
- Vendor: James Cole
- Date: 2026-04-27
- Version: v6.6.2
- Original notes: https://github.com/firefly-iii/firefly-iii/releases/tag/v6.6.2
- Permalink: https://whatsnew.fyi/product/firefly-iii/releases/v6.6.2

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'.

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- **added** — Implement password validation JavaScript script
- **added** — Fix shrinked sidebar expanding when navigating by clicking on icons
- **fixed** — The Running balance column now shows the respective calculation instantly for new records that use Rules
- **fixed** — Set a year validator accepted by the system when saving or editing a transaction
- **security** — Fixed an issue where OAuth tokens could be generated before confirming 2FA state, which would allow access to data when password was stolen despite MFA being enabled

Welcome to release v6.6.2 of Firefly III. It contains the latest fixes, translations and features. Docker users can find this release under the `latest` tag.

##### Changelog

<!-- summary: This releases fixes a security issue and some small UI issues. Please upgrade at your earliest convenience. -->

###### Added

- [PR 12179](https://github.com/firefly-iii/firefly-iii/pull/12179) (implement password validation JS script) reported by @tasnim0tantawi
- [PR 12182](https://github.com/firefly-iii/firefly-iii/pull/12182) (fix shrinked sidebar expanding when navigating by clicking on icons) reported by @tasnim0tantawi

###### Fixed

- [Issue 12169](https://github.com/firefly-iii/firefly-iii/issues/12169) (The 'Running balance' column is not showing the respective calculation instantly for new records that use 'Rules') reported by @jgmm81
- [Issue 12186](https://github.com/firefly-iii/firefly-iii/issues/12186) (Set a year validator accepted by the system when saving or editing a transaction) reported by @jgmm81

###### Security

- Fixed an issue where oAuth tokens could be generated before you confirmed your 2FA state. This would allow access to your data when your password was stolen, despite you having MFA enabled.

##### Installation and upgrade instructions

* Please read the installation instructions for [Docker](https://docs.firefly-iii.org/how-to/firefly-iii/installation/docker/), [Portainer](https://docs.firefly-iii.org/how-to/firefly-iii/installation/portainer/), [Kubernetes](https://docs.firefly-iii.org/how-to/firefly-iii/installation/kubernetes/) or [self-managed servers](https://docs.firefly-iii.org/how-to/firefly-iii/installation/self-managed/).
* Alternatively, read the upgrade instructions for [Docker](https://docs.firefly-iii.org/how-to/firefly-iii/upgrade/docker/), [Kubernetes](https://docs.firefly-iii.org/how-to/firefly-iii/upgrade/kubernetes/) or [self-managed servers](https://docs.firefly-iii.org/how-to/firefly-iii/upgrade/self-managed/)

The releases are signed, and you can verify them using the [Firefly III releases PGP key](https://docs.firefly-iii.org/explanation/more-information/signatures/).

##### Develop with Firefly III

Are you interested in (future) API changes to Firefly III, or other interesting dev-related updates? Sign up to the [Firefly III developer newsletter](https://firefly-iii.kit.com/dev) to receive low-frequency updates about the development of Firefly III.

##### Support Firefly III

Did you know you can support the development of Firefly III? You can donate in many ways, like GitHub Sponsors or Patreon. Please [follow this link](https://bit.ly/donate-to-Firefly-III) for more information. Thank you for your consideration.