CVE-2026-27835: wger IDOR Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-xf68-8hjw-7mpm",
  "modified" : "2026-04-15T20:42:17Z",
  "published" : "2026-02-26T22:13:13Z",
  "aliases" : [ "CVE-2026-27835" ],
  "summary" : "wger: IDOR in RepetitionsConfig and MaxRepetitionsConfig API leak other users' workout data",
  "details" : "### Summary\n\n`RepetitionsConfigViewSet` and `MaxRepetitionsConfigViewSet` return all users' repetition config data because their `get_queryset()` calls `.all()` instead of filtering by the authenticated user. Any registered user can enumerate every other user's workout structure.\n\n### Details\n\n`wger/manager/api/views.py:499` and `:518`:\n\n```python\n# VULNERABLE\nclass RepetitionsConfigViewSet(viewsets.ModelViewSet):\n    def get_queryset(self):\n        return RepetitionsConfig.objects.all()\n\nclass MaxRepetitionsConfigViewSet(viewsets.ModelViewSet):\n    def get_queryset(self):\n        return MaxRepetitionsConfig.objects.all()\n```\n\nEvery sibling viewset in the same file correctly filters by user. For example, `WeightConfigViewSet` at line 459:\n\n```python\n# CORRECT — how it should work\ndef get_queryset(self):\n    return WeightConfig.objects.filter(\n        slot_entry__slot__day__routine__user=self.request.user\n    )\n```\n\nThe same user filter is present on `SetsConfig`, `RestConfig`, `RiRConfig`, and their Max variants — only `RepetitionsConfig` and `MaxRepetitionsConfig` are missing it.\n\n### PoC\n\n```python\nimport requests\n\nBASE = \"http://localhost\"\nheaders = {\"Authorization\": \"Token YOUR_TOKEN\"}  # any registered user\n\nr = requests.get(f\"{BASE}/api/v2/repetitions-config/\", headers=headers)\nprint(r.json())  # returns ALL users' repetition configs, not just your own\n\nr = requests.get(f\"{BASE}/api/v2/max-repetitions-config/\", headers=headers)\nprint(r.json())  # same — all users' max repetition configs\n```\n\nRegistration is open by default. Sequential IDs allow full enumeration.\n\n### Impact\n\nAny authenticated user can read other users' repetition and max-repetitions configs, exposing workout structure (slot entry IDs, iteration values, operations, step counts, repeat flags, requirements JSON). This is a broken object-level authorization (BOLA/IDOR) vulnerability — the same class of issue as OWASP API1.\n\n**Fix**: Add the same user filter used by every other config viewset:\n```python\ndef get_queryset(self):\n    return RepetitionsConfig.objects.filter(\n        slot_entry__slot__day__routine__user=self.request.user\n    )\n```",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "wger"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "2.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/wger-project/wger/security/advisories/GHSA-xf68-8hjw-7mpm"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-27835"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/wger-project/wger/commit/1fda5690b35706bb137850c8a084ec6a13317b64"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/wger-project/wger"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-639" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-02-26T22:13:13Z",
    "nvd_published_at" : "2026-02-26T22:20:49Z"
  }
}