# CVE-2026-52826

## Summary

- **CVE ID:** CVE-2026-52826
- **Severity:** MEDIUM
- **CVSS Score:** 5.3 (CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N)
- **CWE:** CWE-285, CWE-639
- **Published:** Sep 15, 2026
- **Last Modified:** Sep 15, 2026

## Description

Kimai is an open-source time tracking application. Prior to 2.57.0, GET or POST requests to /en/admin/project/{id}/rate/{rate}, /en/admin/customer/{id}/rate/{rate}, and /en/admin/activity/{id}/rate/{rate} independently resolve the authorized parent identifier and the attacker-selected child rate identifier without confirming that the ProjectRate, CustomerRate, or ActivityRate belongs to that parent. An authenticated user who can edit one parent object can pair it with a rate record from an unauthorized project, customer, or activity and persist changes to billing configuration in kimai2_projects_rates, kimai2_customers_rates, or kimai2_activities_rates. This issue is fixed in version 2.57.0.

## Affected Products

- kimai — kimai (< 2.57.0)

## References

- [CNA](https://github.com/kimai/kimai/security/advisories/GHSA-2xgg-2x8h-8xw4)
- [CNA](https://github.com/kimai/kimai/pull/5929)
- [CNA](https://github.com/kimai/kimai/commit/976d38e8a4485a1c923ee7b5841849e91a06e849)
- [CNA](https://github.com/kimai/kimai/releases/tag/2.57.0)
- [CNA](https://www.kimai.org/en/security/ghsa-2xgg-2x8h-8xw4)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.26%
- **EPSS Percentile:** 17.5

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-17._