Firefly III user API endpoints expose all users' information to any authenticated user (IDOR)

Severity: medium · CVSS 4 · Published 2026-03-07

Firefly III user API endpoints expose all users' information to any authenticated user (IDOR)

Technologies: grumpydictator/firefly-iii (Packagist). Vendors: Packagist.

Quick answers

Is This vulnerability exploited in the wild?
No. Junglewise Threat Intelligence has no report of This vulnerability being exploited in the wild.
How severe is This vulnerability?
Medium severity, with a CVSS score of 4, published 7 March 2026.
Which products and versions are affected?
grumpydictator/firefly-iii (Packagist) ECOSYSTEM:introduced=6.4.23,fixed=6.5.1.
Is there a fix for This vulnerability?
Yes. grumpydictator/firefly-iii (Packagist): upgrade to 6.5.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected?
Check whether you run grumpydictator/firefly-iii (Packagist) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • grumpydictator/firefly-iii (Packagist): upgrade to 6.5.1 or later
    composer require grumpydictator/firefly-iii:^6.5.1

Affected products

  • grumpydictator/firefly-iii (Packagist) ECOSYSTEM:introduced=6.4.23,fixed=6.5.1

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