GHSA-j5mc-p8qg-39j7: Kimai/kimai Kimai Favorite Timesheet Add And Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-j5mc-p8qg-39j7",
  "modified" : "2026-07-02T20:44:05Z",
  "published" : "2026-07-02T20:44:05Z",
  "aliases" : [ ],
  "summary" : "Kimai Favorite Timesheet Add and Remove Endpoints Allows Cross-User Bookmark Manipulation",
  "details" : "### Summary\n\nKimai 2.56.0 contains an authenticated improper authorization / IDOR vulnerability in the favorite timesheet add and remove endpoints. A low-privileged user who knows another user's `timesheet.id` can add that record to, or remove it from, the victim's `favorite/recent` bookmark list. This allows cross-user manipulation of per-user favorite state without administrative privileges.\n\n### Details\n\nThe issue affects the following routes:\n\n- `GET /en/favorite/timesheet/add/{id}`\n- `GET /en/favorite/timesheet/remove/{id}`\n\nBoth endpoints accept a user-controlled timesheet identifier and only require the caller to hold the generic `start_own_timesheet` permission. They do not verify that the referenced `Timesheet` object belongs to the currently authenticated user.\n\n- In `src/Controller/FavoriteController.php`, the controller methods accept a `Timesheet` object directly and forward it to the favorite service. \n- The root cause becomes more obvious in `src/Timesheet/FavoriteRecordService.php`. The bookmark owner is derived from `$timesheet->getUser()` instead of the current session user.\n- Because of this design, any authenticated user who can reference another user's timesheet ID can modify the victim's `favorite/recent` bookmark data.\n\n*A PoC was provided, but removed for security reasons.*\n\n### Impact\n\nThis vulnerability allows any authenticated low-privileged user to manipulate another user's favorite bookmark state across accounts. An attacker can inject arbitrary victim-owned timesheet entries into the victim's quick-entry workflow, remove existing favorites, and repeatedly disturb the victim's normal timesheet usage without needing administrative privileges.\n\nThe issue does not directly disclose sensitive data, but it is a real cross-user business-state tampering vulnerability with clear integrity impact. Because the add and remove endpoints can be combined, an attacker can reliably insert, remove, and reorder entries in another user's `favorite/recent` list.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "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/E:U"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "kimai/kimai"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.57.0"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 2.56.0"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/kimai/kimai/security/advisories/GHSA-j5mc-p8qg-39j7"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/kimai/kimai"
  }, {
    "type" : "WEB",
    "url" : "https://www.kimai.org/en/security/ghsa-j5mc-p8qg-39j7"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-639", "CWE-862" ],
    "severity" : "LOW",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-07-02T20:44:05Z",
    "nvd_published_at" : null
  }
}