CVE-2026-52825 (GCVE-0-2026-52825)

Vulnerability from cvelistv5 – Published: 2026-09-15 10:39 – Updated: 2026-09-15 12:34

Title

Kimai: Improper Authorization in Kimai Team Member and Team Activity Assignment APIs Allows Expansion of Team Scope Beyond Authorized Visibility

Summary

Kimai is an open-source time tracking application. Prior to 2.58.0, POST /api/teams/{id}/members/{userId} and POST /api/teams/{id}/activities/{activityId} verify that a teamlead may edit the Team but do not verify access_user for the referenced User or view access for the referenced Activity. A teamlead can add users or activities outside the teamlead's manageable scope to an editable team, bypassing the narrower choices enforced by TeamEditForm and UserRepository::getQueryBuilderForFormType(). The resulting relationships can be trusted by RolePermissionManager::checkTeamAccessActivity() and other team-based authorization, visibility, reporting, and workflow logic. This issue is fixed in version 2.58.0.

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 12:34 UTC

CWE

CWE-285 - Improper Authorization
CWE-862 - Missing Authorization

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/5952	x_refsource_MISC
https://github.com/kimai/kimai/commit/31a8f887a5c…	x_refsource_MISC
https://github.com/kimai/kimai/releases/tag/2.58.0	x_refsource_MISC
https://www.kimai.org/en/security/ghsa-xv4r-4885-gwpg	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
kimai	kimai	Affected: < 2.58.0	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-52825

Vulnerability from fkie_nvd - Published: 2026-09-15 11:17 - Updated: 2026-09-15 13:16

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/31a8f887a5cda517db7b4320a7ad997c87d08601
	security-advisories@github.com	https://github.com/kimai/kimai/pull/5952
	security-advisories@github.com	https://github.com/kimai/kimai/releases/tag/2.58.0
	security-advisories@github.com	https://github.com/kimai/kimai/security/advisories/GHSA-xv4r-4885-gwpg
	security-advisories@github.com	https://www.kimai.org/en/security/ghsa-xv4r-4885-gwpg

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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  "affected": [
    {
      "affectedData": [
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          "product": "kimai",
          "vendor": "kimai",
          "versions": [
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    }
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    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/kimai/kimai/pull/5952"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/kimai/kimai/releases/tag/2.58.0"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/kimai/kimai/security/advisories/GHSA-xv4r-4885-gwpg"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://www.kimai.org/en/security/ghsa-xv4r-4885-gwpg"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-285"
        },
        {
          "lang": "en",
          "value": "CWE-862"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

GHSA-XV4R-4885-GWPG

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

Summary

Kimai has Improper Authorization in Team Member and Team Activity Assignment APIs Which Allows Expansion of Team Scope Beyond Authorized Visibility

Details

Summary

Kimai contains an authenticated improper authorization vulnerability in Team-related assignment APIs. A Teamlead who can edit their own team can use backend API endpoints to add users or activities that fall outside their intended visible or manageable scope, even when the frontend correctly hides those targets.

This affects both team member assignment and team activity assignment. The issue is caused by treating "may edit this team" as equivalent to "may attach any referenced object to this team", without performing a second authorization check on the target user or activity.

Details

The issue affects at least the following API routes:

POST /api/teams/{id}/members/{userId}
POST /api/teams/{id}/activities/{activityId}

In both cases, the backend checks whether the caller may edit the Team, but it does not verify whether the referenced User or Activity falls inside the caller's allowed management scope.

For team member assignment, the frontend form correctly limits the visible user choices. In src/Form/TeamEditForm.php, the team edit form uses UserType:

$builder->add('users', UserType::class, [
    'label' => 'add_user.label',
    'help' => 'team.add_user.help',
    'mapped' => false,
    'multiple' => false,
    'expanded' => false,
    'required' => false,
    'ignore_users' => $team !== null ? $team->getUsers() : []
]);

In src/Form/Type/UserType.php, the user selector is built from UserRepository::getQueryBuilderForFormType():

$query = new UserFormTypeQuery();
$query->setUser($options['user']);

$qb = $this->userRepository->getQueryBuilderForFormType($query);
$users = $qb->getQuery()->getResult();

And in src/Repository/UserRepository.php, Teamlead-visible candidates are limited to team members from teams they lead:

if (null !== $user && $user->isTeamlead()) {
    $userIds = [];
    foreach ($user->getTeams() as $team) {
        if ($team->isTeamlead($user)) {
            foreach ($team->getUsers() as $teamMember) {
                $userIds[] = $teamMember->getId();
            }
        }
    }
    $userIds = array_unique($userIds);
    $qb->setParameter('teamMember', $userIds);
    $or->add($qb->expr()->in('u.id', ':teamMember'));
}

However, the actual member-assignment API does not reuse that restriction. In src/API/TeamController.php:

#[IsGranted('edit', 'team')]
#[Route(methods: ['POST'], path: '/{id}/members/{userId}', name: 'post_team_member', requirements: ['id' => '\d+', 'userId' => '\d+'])]
public function postMemberAction(Team $team, #[MapEntity(mapping: ['userId' => 'id'])] User $member): Response
{
    if ($member->isInTeam($team)) {
        throw new BadRequestHttpException('User is already member of the team');
    }

    $team->addUser($member);
    $this->teamService->saveTeam($team);
}

For activity assignment, the same pattern appears. In src/API/TeamController.php:

#[IsGranted('edit', 'team')]
#[Route(methods: ['POST'], path: '/{id}/activities/{activityId}', name: 'post_team_activity', requirements: ['id' => '\d+', 'activityId' => '\d+'])]
public function postActivityAction(Team $team, #[MapEntity(mapping: ['activityId' => 'id'])] Activity $activity, ActivityRepository $activityRepository): Response
{
    if ($team->hasActivity($activity)) {
        throw new BadRequestHttpException('Team has already access to activity');
    }

    $team->addActivity($activity);
    $activityRepository->saveActivity($activity);
}

The Team voter only checks whether the current user may edit that team, not whether the referenced object is within the Teamlead's legitimate scope. In src/Voter/TeamVoter.php:

if (!$user->isAdmin() && !$user->isSuperAdmin() && !$user->isTeamleadOf($subject)) {
    return false;
}

return $this->permissionManager->hasRolePermission($user, $attribute . '_team');

For activities, this is especially risky because later authorization logic may trust the team assignment that was just written. In src/Security/RolePermissionManager.php:

public function checkTeamAccessActivity(Activity $activity, User $user): bool
{
    if ($activity->getProject() !== null && !$this->checkTeamAccessProject($activity->getProject(), $user)) {
        return false;
    }

    return $this->checkTeamAccess($activity->getTeams(), $user);
}

So once a Teamlead is able to write a new team/activity relation, later access-control decisions may treat that relation as legitimate input.

A PoC was provided, but removed for security reasons.

Impact

This vulnerability allows a Teamlead to use their own editable team as an expansion container for objects that should remain outside their authorized scope. In the validated member-assignment case, the attacker can forcibly add users who are not supposed to be manageable through that Teamlead's visible range. In the activity-assignment case, the attacker can attach activities that are outside the intended authorization boundary of the team.

Once such relations are written, downstream authorization, visibility, and business workflows may start treating them as legitimate. This can affect user scoping, team-based access control, customer/project/activity visibility, time-entry behavior, statistics, and reporting. The issue therefore breaks the trustworthiness of Team as a security isolation container.

Solution

Several new permission checks were added to src/API/TeamController.php - - Check if user can be accessed with #[IsGranted('access_user', 'member')] before adding as new team member - Check if customer can be seen with #[IsGranted('view', 'customer')] before a team is granted access to a customer - Check if project can be seen with #[IsGranted('view', 'project')] before a team is granted access to a project - Check if activity can be seen with #[IsGranted('view', 'activity')] before a team is granted access to an activity

See https://www.kimai.org/en/security/ghsa-xv4r-4885-gwpg 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= 2.57.0"
      },
      "package": {
        "ecosystem": "Packagist",
        "name": "kimai/kimai"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.58.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-52825"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-285",
      "CWE-862"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-14T00:09:03Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "### Summary\n\nKimai contains an authenticated improper authorization vulnerability in Team-related assignment APIs. A Teamlead who can edit their own team can use backend API endpoints to add users or activities that fall outside their intended visible or manageable scope, even when the frontend correctly hides those targets.\n\nThis affects both team member assignment and team activity assignment. The issue is caused by treating \"may edit this team\" as equivalent to \"may attach any referenced object to this team\", without performing a second authorization check on the target user or activity.\n\n### Details\n\nThe issue affects at least the following API routes:\n\n- `POST /api/teams/{id}/members/{userId}`\n- `POST /api/teams/{id}/activities/{activityId}`\n\nIn both cases, the backend checks whether the caller may edit the `Team`, but it does not verify whether the referenced `User` or `Activity` falls inside the caller\u0027s allowed management scope.\n\nFor team member assignment, the frontend form correctly limits the visible user choices. In `src/Form/TeamEditForm.php`, the team edit form uses `UserType`:\n\n```php\n$builder-\u003eadd(\u0027users\u0027, UserType::class, [\n    \u0027label\u0027 =\u003e \u0027add_user.label\u0027,\n    \u0027help\u0027 =\u003e \u0027team.add_user.help\u0027,\n    \u0027mapped\u0027 =\u003e false,\n    \u0027multiple\u0027 =\u003e false,\n    \u0027expanded\u0027 =\u003e false,\n    \u0027required\u0027 =\u003e false,\n    \u0027ignore_users\u0027 =\u003e $team !== null ? $team-\u003egetUsers() : []\n]);\n```\n\nIn `src/Form/Type/UserType.php`, the user selector is built from `UserRepository::getQueryBuilderForFormType()`:\n\n```php\n$query = new UserFormTypeQuery();\n$query-\u003esetUser($options[\u0027user\u0027]);\n\n$qb = $this-\u003euserRepository-\u003egetQueryBuilderForFormType($query);\n$users = $qb-\u003egetQuery()-\u003egetResult();\n```\n\nAnd in `src/Repository/UserRepository.php`, Teamlead-visible candidates are limited to team members from teams they lead:\n\n```php\nif (null !== $user \u0026\u0026 $user-\u003eisTeamlead()) {\n    $userIds = [];\n    foreach ($user-\u003egetTeams() as $team) {\n        if ($team-\u003eisTeamlead($user)) {\n            foreach ($team-\u003egetUsers() as $teamMember) {\n                $userIds[] = $teamMember-\u003egetId();\n            }\n        }\n    }\n    $userIds = array_unique($userIds);\n    $qb-\u003esetParameter(\u0027teamMember\u0027, $userIds);\n    $or-\u003eadd($qb-\u003eexpr()-\u003ein(\u0027u.id\u0027, \u0027:teamMember\u0027));\n}\n```\n\nHowever, the actual member-assignment API does not reuse that restriction. In `src/API/TeamController.php`:\n\n```php\n#[IsGranted(\u0027edit\u0027, \u0027team\u0027)]\n#[Route(methods: [\u0027POST\u0027], path: \u0027/{id}/members/{userId}\u0027, name: \u0027post_team_member\u0027, requirements: [\u0027id\u0027 =\u003e \u0027\\d+\u0027, \u0027userId\u0027 =\u003e \u0027\\d+\u0027])]\npublic function postMemberAction(Team $team, #[MapEntity(mapping: [\u0027userId\u0027 =\u003e \u0027id\u0027])] User $member): Response\n{\n    if ($member-\u003eisInTeam($team)) {\n        throw new BadRequestHttpException(\u0027User is already member of the team\u0027);\n    }\n\n    $team-\u003eaddUser($member);\n    $this-\u003eteamService-\u003esaveTeam($team);\n}\n```\n\nFor activity assignment, the same pattern appears. In `src/API/TeamController.php`:\n\n```php\n#[IsGranted(\u0027edit\u0027, \u0027team\u0027)]\n#[Route(methods: [\u0027POST\u0027], path: \u0027/{id}/activities/{activityId}\u0027, name: \u0027post_team_activity\u0027, requirements: [\u0027id\u0027 =\u003e \u0027\\d+\u0027, \u0027activityId\u0027 =\u003e \u0027\\d+\u0027])]\npublic function postActivityAction(Team $team, #[MapEntity(mapping: [\u0027activityId\u0027 =\u003e \u0027id\u0027])] Activity $activity, ActivityRepository $activityRepository): Response\n{\n    if ($team-\u003ehasActivity($activity)) {\n        throw new BadRequestHttpException(\u0027Team has already access to activity\u0027);\n    }\n\n    $team-\u003eaddActivity($activity);\n    $activityRepository-\u003esaveActivity($activity);\n}\n```\n\nThe `Team` voter only checks whether the current user may edit that team, not whether the referenced object is within the Teamlead\u0027s legitimate scope. In `src/Voter/TeamVoter.php`:\n\n```php\nif (!$user-\u003eisAdmin() \u0026\u0026 !$user-\u003eisSuperAdmin() \u0026\u0026 !$user-\u003eisTeamleadOf($subject)) {\n    return false;\n}\n\nreturn $this-\u003epermissionManager-\u003ehasRolePermission($user, $attribute . \u0027_team\u0027);\n```\n\nFor activities, this is especially risky because later authorization logic may trust the team assignment that was just written. In `src/Security/RolePermissionManager.php`:\n\n```php\npublic function checkTeamAccessActivity(Activity $activity, User $user): bool\n{\n    if ($activity-\u003egetProject() !== null \u0026\u0026 !$this-\u003echeckTeamAccessProject($activity-\u003egetProject(), $user)) {\n        return false;\n    }\n\n    return $this-\u003echeckTeamAccess($activity-\u003egetTeams(), $user);\n}\n```\n\nSo once a Teamlead is able to write a new team/activity relation, later access-control decisions may treat that relation as legitimate input.\n\n*A PoC was provided, but removed for security reasons.*\n\n### Impact\n\nThis vulnerability allows a Teamlead to use their own editable team as an expansion container for objects that should remain outside their authorized scope. In the validated member-assignment case, the attacker can forcibly add users who are not supposed to be manageable through that Teamlead\u0027s visible range. In the activity-assignment case, the attacker can attach activities that are outside the intended authorization boundary of the team.\n\nOnce such relations are written, downstream authorization, visibility, and business workflows may start treating them as legitimate. This can affect user scoping, team-based access control, customer/project/activity visibility, time-entry behavior, statistics, and reporting. The issue therefore breaks the trustworthiness of `Team` as a security isolation container.\n\n# Solution\n\nSeveral new permission checks were added to `src/API/TeamController.php` -\n- Check if user can be accessed with `#[IsGranted(\u0027access_user\u0027, \u0027member\u0027)]` before adding as new team member \n- Check if customer can be seen with `#[IsGranted(\u0027view\u0027, \u0027customer\u0027)]` before a team is granted access to a customer\n- Check if project can be seen with `#[IsGranted(\u0027view\u0027, \u0027project\u0027)]` before a team is granted access to a project\n- Check if activity can be seen with `#[IsGranted(\u0027view\u0027, \u0027activity\u0027)]` before a team is granted access to an activity\n\nSee [https://www.kimai.org/en/security/ghsa-xv4r-4885-gwpg](https://www.kimai.org/en/security/ghsa-xv4r-4885-gwpg) for more information.",
  "id": "GHSA-xv4r-4885-gwpg",
  "modified": "2026-07-14T00:09:03Z",
  "published": "2026-07-14T00:09:03Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/kimai/kimai/security/advisories/GHSA-xv4r-4885-gwpg"
    },
    {
      "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 has Improper Authorization in Team Member and Team Activity Assignment APIs Which Allows Expansion of Team Scope Beyond Authorized Visibility"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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-2026-52825 (GCVE-0-2026-52825)

FKIE_CVE-2026-52825

GHSA-XV4R-4885-GWPG

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