# CVE-2026-52824

## Summary

- **CVE ID:** CVE-2026-52824
- **Severity:** CRITICAL
- **CVSS Score:** 9.1 (CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N)
- **CWE:** CWE-1188
- **Published:** Sep 15, 2026
- **Last Modified:** Sep 16, 2026

## Description

Kimai is an open-source time tracking application. Prior to 2.58.0, the official Docker image sets APP_SECRET to the public value change_this_to_something_unique in Dockerfile, and .docker/entrypoint.sh neither replaces nor rejects that value before Symfony uses it as kernel.secret. An unauthenticated attacker who reaches a deployment that did not override APP_SECRET, knows a username, correctly guesses the account ID associated with that username, and targets an account without active two-factor authentication can forge HMAC-protected authentication artifacts, including KIMAI_REMEMBER cookies and login links, to access the account without its password. The updated entrypoint generates and persists a random secret when no safe operator-provided value exists. This issue is fixed in version 2.58.0.

## Affected Products

- kimai — kimai (< 2.58.0)

## References

- [CNA](https://github.com/kimai/kimai/security/advisories/GHSA-jr9p-4h4j-6c58)
- [CNA](https://github.com/kimai/kimai/pull/5952)
- [CNA](https://github.com/kimai/kimai/commit/31a8f887a5cda517db7b4320a7ad997c87d08601)
- [CNA](https://github.com/kimai/kimai/releases/tag/2.58.0)
- [CNA](https://www.kimai.org/en/security/ghsa-jr9p-4h4j-6c58)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 2.06%
- **EPSS Percentile:** 80.4

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._