CVE-2026-52826 (GCVE-0-2026-52826)

Vulnerability from cvelistv5 – Published: 2026-09-15 10:42 – Updated: 2026-09-15 12:41

Title

Kimai: Improper Authorization in Kimai Project, Customer, and Activity Rate Edit Endpoints Allows Cross-Scope Rate Manipulation

Summary

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.

Severity

5.3 (Medium)


                        
                          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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-15 12:41 UTC

CWE

CWE-285 - Improper Authorization
CWE-639 - Authorization Bypass Through User-Controlled Key

Assigner

GitHub_M mitre root

References

5 references

URL	Tags
https://github.com/kimai/kimai/security/advisorie…	x_refsource_CONFIRM
https://github.com/kimai/kimai/pull/5929	x_refsource_MISC
https://github.com/kimai/kimai/commit/976d38e8a44…	x_refsource_MISC
https://github.com/kimai/kimai/releases/tag/2.57.0	x_refsource_MISC
https://www.kimai.org/en/security/ghsa-2xgg-2x8h-8xw4	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
kimai	kimai	Affected: < 2.57.0	guessed

Show details on NVD website

JSON

To clipboard

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}

FKIE_CVE-2026-52826

Vulnerability from fkie_nvd - Published: 2026-09-15 11:17 - Updated: 2026-09-23 18:22

Severity

5.3 (Medium) - 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

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/kimai/kimai/commit/976d38e8a4485a1c923ee7b5841849e91a06e849
	security-advisories@github.com	https://github.com/kimai/kimai/pull/5929
	security-advisories@github.com	https://github.com/kimai/kimai/releases/tag/2.57.0
	security-advisories@github.com	https://github.com/kimai/kimai/security/advisories/GHSA-2xgg-2x8h-8xw4
	security-advisories@github.com	https://www.kimai.org/en/security/ghsa-2xgg-2x8h-8xw4

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "kimai",
          "vendor": "kimai",
          "versions": [
            {
              "status": "affected",
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            }
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    }
  ],
  "id": "CVE-2026-52826",
  "lastModified": "2026-09-23T18:22:16.503",
  "metrics": {
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      {
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          "attackVector": "NETWORK",
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          "baseScore": 5.3,
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  },
  "published": "2026-09-15T11:17:09.837",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/kimai/kimai/commit/976d38e8a4485a1c923ee7b5841849e91a06e849"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/kimai/kimai/pull/5929"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/kimai/kimai/releases/tag/2.57.0"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/kimai/kimai/security/advisories/GHSA-2xgg-2x8h-8xw4"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://www.kimai.org/en/security/ghsa-2xgg-2x8h-8xw4"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-285"
        },
        {
          "lang": "en",
          "value": "CWE-639"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

GHSA-2XGG-2X8H-8XW4

Vulnerability from github – Published: 2026-07-14 00:09 – Updated: 2026-07-14 00:09

Summary

Kimai: Improper Authorization in Project, Customer, and Activity Rate Edit Endpoints Allows Cross-Scope Rate Manipulation

Details

Summary

Kimai 2.56.0 contains an authenticated improper authorization vulnerability in the Web rate editing flows for projects, customers, and activities. A user who can edit one authorized parent object can combine that authorized parent ID with the rate ID of a different, unauthorized parent object and thereby modify the unauthorized rate record.

This affects ProjectRate, CustomerRate, and ActivityRate editing. The issue is caused by missing parent-child consistency validation and allows cross-project, cross-customer, or cross-activity tampering of billing-related configuration.

Details

The issue affects the following Web routes:

GET/POST /en/admin/project/{id}/rate/{rate}
GET/POST /en/admin/customer/{id}/rate/{rate}
GET/POST /en/admin/activity/{id}/rate/{rate}

In both cases, the parent object and the rate object are resolved independently from user-controlled route parameters. The controller only checks whether the current user may edit the parent object referenced by {id}, but it does not verify that the child rate object referenced by {rate} actually belongs to that same parent.

In these controllers, there is no validation such as:

$rate->getProject() === $project
$rate->getCustomer() === $customer
$rate->getActivity() === $activity

This missing binding check is especially notable because the API delete endpoints already enforce the expected parent-child relationship.

This shows that parent-child consistency is already a recognized invariant in the application design, but the Web edit endpoints fail to enforce it for projects, customers, and activities.

A PoC was provided, but removed for security reasons.

Impact

This vulnerability allows authenticated users to tamper with billing-related rate configuration outside their authorized project, customer, or activity scope. An attacker can modify rate values belonging to other teams or business domains, which can affect time-based settlement, inherited pricing, cost calculations, budget reporting, revenue reporting, and downstream invoice generation.

Because the issue directly persists changes into kimai2_projects_rates, kimai2_customers_rates, and kimai2_activities_rates, it is a real cross-scope integrity vulnerability rather than a UI-only flaw. The attack breaks team-based isolation boundaries for high-value financial configuration.

Solution

The rate edit forms for customers, projects and activities now verify that the rate belongs to the parent referenced in the URL and reject the request otherwise.

See https://www.kimai.org/en/security/ghsa-2xgg-2x8h-8xw4 for more information.

Severity

5.3 (Medium)


                  
                    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

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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 2.56.0"
      },
      "package": {
        "ecosystem": "Packagist",
        "name": "kimai/kimai"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.57.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-52826"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-285",
      "CWE-639"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-14T00:09:35Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "### Summary\n\nKimai 2.56.0 contains an authenticated improper authorization vulnerability in the Web rate editing flows for projects, customers, and activities. A user who can edit one authorized parent object can combine that authorized parent ID with the rate ID of a different, unauthorized parent object and thereby modify the unauthorized rate record.\n\nThis affects `ProjectRate`, `CustomerRate`, and `ActivityRate` editing. The issue is caused by missing parent-child consistency validation and allows cross-project, cross-customer, or cross-activity tampering of billing-related configuration.\n\n### Details\n\nThe issue affects the following Web routes:\n\n- `GET/POST /en/admin/project/{id}/rate/{rate}`\n- `GET/POST /en/admin/customer/{id}/rate/{rate}`\n- `GET/POST /en/admin/activity/{id}/rate/{rate}`\n\nIn both cases, the parent object and the rate object are resolved independently from user-controlled route parameters. The controller only checks whether the current user may edit the parent object referenced by `{id}`, but it does not verify that the child rate object referenced by `{rate}` actually belongs to that same parent.\n\nIn these controllers, there is no validation such as:\n\n- `$rate-\u003egetProject() === $project`\n- `$rate-\u003egetCustomer() === $customer`\n- `$rate-\u003egetActivity() === $activity`\n\nThis missing binding check is especially notable because the API delete endpoints already enforce the expected parent-child relationship.\n\nThis shows that parent-child consistency is already a recognized invariant in the application design, but the Web edit endpoints fail to enforce it for projects, customers, and activities.\n\n*A PoC was provided, but removed for security reasons.*\n\n### Impact\n\nThis vulnerability allows authenticated users to tamper with billing-related rate configuration outside their authorized project, customer, or activity scope. An attacker can modify rate values belonging to other teams or business domains, which can affect time-based settlement, inherited pricing, cost calculations, budget reporting, revenue reporting, and downstream invoice generation.\n\nBecause the issue directly persists changes into `kimai2_projects_rates`, `kimai2_customers_rates`, and `kimai2_activities_rates`, it is a real cross-scope integrity vulnerability rather than a UI-only flaw. The attack breaks team-based isolation boundaries for high-value financial configuration.\n\n# Solution\n\nThe rate edit forms for `customers`, `projects` and `activities` now verify that the rate belongs to the parent referenced in the URL and reject the request otherwise.\n\nSee [https://www.kimai.org/en/security/ghsa-2xgg-2x8h-8xw4](https://www.kimai.org/en/security/ghsa-2xgg-2x8h-8xw4) for more information.",
  "id": "GHSA-2xgg-2x8h-8xw4",
  "modified": "2026-07-14T00:09:35Z",
  "published": "2026-07-14T00:09:35Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/kimai/kimai/security/advisories/GHSA-2xgg-2x8h-8xw4"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/kimai/kimai"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Kimai: Improper Authorization in Project, Customer, and Activity Rate Edit Endpoints Allows Cross-Scope Rate Manipulation"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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Action not permitted

CVE-2026-52826 (GCVE-0-2026-52826)

FKIE_CVE-2026-52826

GHSA-2XGG-2X8H-8XW4

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