CVE-2026-43976 wger-project CVE debrief

Who should care

Defenders responsible for wger installations, particularly those with user management and permission systems, should assess their exposure and verify their installations to prevent potential data leaks.

Why it matters

CVE-2026-43976 highlights the importance of proper gym-scope guard implementation in wger to prevent cross-tenant data leaks. Defenders should verify their installations and ensure they are updated to version 2.6 or later to prevent potential data leaks.

• Potential data leaks of private admin notes, uploaded documents, gym contracts, user configuration, and user permission data
• Cross-tenant data access by trainers with specific permissions and no gym assignment
• Verification priority for wger installations and user permissions
• Remediation priority for updating to version 2.6 or later

Technical summary

The vulnerability in wger allows trainers with 'gym.gym_trainer' and 'gym.add_adminusernote' permissions and no gym assignment to read private admin notes, uploaded documents, gym contracts, user configuration, and user permission data for other unaffiliated users. This is due to a flawed gym-scope guard implementation that silently passes when both operands are 'None'. The issue was fixed in version 2.6, which highlights the importance of proper gym-scope guard implementation to prevent cross-tenant data leaks. Defenders should prioritize verifying their wger installations and ensuring they are updated to version 2.6 or later to prevent potential data leaks. The flawed guard implementation allows for cross-

Defensive priority

Defenders should prioritize verifying their wger installations and ensuring they are updated to version 2.6 or later to prevent potential data leaks.

Recommended defensive actions

• Verify wger installation version and update to 2.6 or later if necessary.
• Review user permissions and ensure proper gym-scope guard implementation.
• Monitor for potential data leaks or unauthorized access.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.

Evidence notes

The CVE record and source item provide details on the vulnerability, its impact, and the fix in version 2.6. However, there is limited information on potential exploitation or affected deployments. Defenders should verify their wger installations, review user permissions, and ensure proper gym-scope guard implementation to prevent potential data leaks. The vulnerability allows trainers with 'gym.gym_trainer' and 'gym.add_adminusernote' permissions and no gym assignment to read private admin notes, uploaded documents, gym contracts, A

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.