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

Source: https://junglewise.ai/threats/firefly-iii-user-api-endpoints-expose-all-users-information-to-any-28231c21  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-03-07  
License: CC BY 4.0 with a link back

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)](https://junglewise.ai/threats/technologies/grumpydictator-firefly-iii). Vendors: [Packagist](https://junglewise.ai/threats/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

  ```sh
  composer require grumpydictator/firefly-iii:^6.5.1
  ```


## Affected products

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

## Related threats

- [Project Firefly III SSRF in webhook management component](https://junglewise.ai/threats/cve-2026-50886-project-firefly-iii-ssrf-in-webhook-management-component)
- [Firefly III Stored XSS in Audit Log Entry via piggy bank name](https://junglewise.ai/threats/firefly-iii-stored-xss-in-audit-log-entry-via-piggy-bank-name-79c37ea2)
- [Firefly III has a MFA bypass in oauth flow](https://junglewise.ai/threats/cve-2024-37893-firefly-iii-has-a-mfa-bypass-in-oauth-flow)
- [C5 Firefly III CSV Injection.](https://junglewise.ai/threats/c5-firefly-iii-csv-injection-f3c22e29)
- [Firefly III allows webhooks HTML Injection.](https://junglewise.ai/threats/cve-2024-22075-firefly-iii-allows-webhooks-html-injection)