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High, CVSS 7.1amended

wger: cross-tenant admin notes/contracts leak via gym=None bypass (5 views)

CVE-2026-43976GHSA-c72h-82w6-rqfp

What to do

Vendor response not established. Follow the primary source's mitigation guidance and check back for a fix.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • PyPI wger

    Affected
    <= 2.1
    Fixed in
    no fixed version recorded

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
7.1 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
EPSS
  • CVE-2026-43976: 0.22% estimated exploitation activity in the next 30 days; percentile 12.52 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Summary Five gym management views in wger apply a flawed gym-scope guard (`gym_a != gym_b`) that silently passes when both operands are `None`. A trainer with `gym.gym_trainer` and `gym.add_adminusernote` permissions and no gym assignment (`gym=None`) can read private admin notes, uploaded documents, gym contracts, user configuration, and user permission data for any other unaffiliated user on the instance. The subsequent querysets filter only on the attacker-supplied `member_id` with no secondary gym-scoped validation, so all records are disclosed.

Details Files: `wger/gym/views/user.py`, `wger/gym/views/admin_notes.py`, `wger/gym/views/document.py`, `wger/gym/views/contract.py`, `wger/gym/views/user_config.py` The same flawed comparison pattern appears across at least five views: ```python

VULNERABLE - applied in admin_notes_list, documents_list, contracts_list,

user_config, and gym_permissions_user_edit if request.user.userprofile.gym != user.userprofile.gym:…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 5 · amended ·

    Amended from osv record GHSA-c72h-82w6-rqfp

  2. Revision 4 · amended ·

    Amended from ghsa record GHSA-c72h-82w6-rqfp

  3. Revision 3 · amended ·

    Amended from ghsa record GHSA-c72h-82w6-rqfp

  4. Revision 2 · amended ·

    Amended from osv record GHSA-c72h-82w6-rqfp

  5. Revision 1 · created ·

    Published from ghsa record GHSA-c72h-82w6-rqfp

Agent brief

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# Patch Next advisory brief: CVE-2026-43976

Advisory: wger: cross-tenant admin notes/contracts leak via gym=None bypass (5 views)
IDs: CVE-2026-43976, GHSA-c72h-82w6-rqfp
Record: https://patchnext.com/advisories/cve-2026-43976 (revision 5, source checked 27 Oct 2026, 06:15 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.1)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor response not established. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI wger: affected <= 2.1

## Suggested inspection (read-only)
- `python -m pip show wger`: prints the installed version. Run with the environment that serves production active.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on wger.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-c72h-82w6-rqfp (GitHub-reviewed advisory GHSA-c72h-82w6-rqfp lists affected ranges: PyPI wger >=0 <=2.1)
- Verified: https://osv.dev/vulnerability/GHSA-c72h-82w6-rqfp (OSV record GHSA-c72h-82w6-rqfp lists affected ranges: PyPI wger >=0 <=2.1)

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