CVE-2026-40486Network attack vector

Authenticated billing-rate tampering via disabled-preference persistence

Published Apr 17, 2026 · Updated Apr 17, 2026

Improper attribute authorization in Kimai before 2.53.0 allows remote authenticated users to alter their own restricted billing rates. The User Preferences API PATCH endpoint persists hourly_rate and internal_rate values without checking each preference object's isEnabled() restriction. A standard account with API access can change only its own rates, affecting future timesheets, invoices, exports, and internal financial data.

CVSS severity4.3
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper attribute authorization in Kimai before 2.53.0 allows remote authenticated users to alter their own restricted billing rates. The User Preferences API PATCH endpoint persists hourly_rate and internal_rate values without checking each preference object's isEnabled() restriction. A standard account with API access can change only its own rates, affecting future timesheets, invoices, exports, and internal financial data.

The record

CVE
CVE-2026-40486
Published
Apr 17, 2026
Updated
Apr 17, 2026
Vendor
Kimai
Product
Kimai
Classifications
CWE-915, T1565.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 17, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2.53.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Kimai · Kimaiversion=< 2.53.0

Published CVSS scores

4.3GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-915Improperly Controlled Modification of Dynamically-Determined Object Attributes
T1565.001Stored Data Manipulation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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