CVE-2026-43977 in wger
Summary
by MITRE • 07/17/2026
wger is a free, open-source workout and fitness manager. In versions prior to 2.6, any authenticated user can read another user's private workout session notes, exercise history, and training statistics by calling the /logs/ and /stats/ actions on a routine they do not own. The vulnerability exists in RoutineViewSet (wger/manager/api/views.py). The view defines two custom actions /logs/ and /stats/ that are intended to return data for the requesting user's own training history within a routine. However, the underlying permission check (RoutinePermission.has_object_permission) grants read access to any authenticated user when the routine has is_template=True, regardless of ownership. When the /logs/ or /stats/ actions are invoked against a routine the attacker does not own, they return the owner's private workout history, not the attacker's. This issue has been fixed in version 2.6.
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Analysis
by VulDB Data Team • 07/17/2026
This vulnerability in wger fitness manager represents a critical authorization flaw that allows authenticated users to access sensitive personal data belonging to other users. The issue stems from improper permission validation within the RoutineViewSet class located in wger/manager/api/views.py, where two custom actions /logs/ and /stats/ are defined to retrieve workout session notes, exercise history, and training statistics. The vulnerability specifically manifests when a routine has the is_template=True attribute, which bypasses normal ownership checks that should prevent unauthorized data access.
The technical flaw resides in the RoutinePermission.has_object_permission method implementation, which incorrectly grants read access to any authenticated user when dealing with template routines regardless of actual ownership status. This misconfiguration creates a path where attackers can exploit the API endpoints by calling /logs/ and /stats/ actions against routines they do not own, resulting in the exposure of private workout data that should only be accessible to the routine's legitimate owner. The vulnerability affects all versions prior to 2.6 and demonstrates a classic case of insufficient access control where the system fails to properly verify user authorization before granting data access.
The operational impact of this vulnerability is significant as it compromises user privacy and creates potential for data misuse. Any authenticated user can leverage this flaw to obtain detailed workout session notes, exercise history, and training statistics of other users, effectively breaking the confidentiality of personal fitness information. This type of vulnerability falls under CWE-284 Access Control Issues, specifically representing an authorization bypass where the system grants permissions beyond what is intended for the requesting user. The exposure of such sensitive personal data could lead to privacy violations, identity theft risks, or even social engineering attacks based on detailed fitness patterns and progress tracking information.
From a cybersecurity perspective, this vulnerability aligns with ATT&CK technique T1213 Data from Information Repositories, as it involves unauthorized access to stored user data within an information repository. The flaw represents a failure in the principle of least privilege where users are granted access rights beyond their legitimate scope. Organizations using affected versions of wger should immediately implement mitigations including updating to version 2.6 or later, implementing proper access control validation for all API endpoints, and conducting thorough security reviews of authorization mechanisms. Additionally, regular security testing of API endpoints and mandatory code reviews for permission logic can help prevent similar authorization bypass vulnerabilities in future implementations. The fix in version 2.6 demonstrates the importance of proper permission validation and the need for comprehensive testing of access control mechanisms before deployment.