CVE-2026-77135 in Femanager Plugin
Summary
by MITRE • 08/25/2026
The extension's user detail view fails to verify that a requested user record matches the configured or logged-in target, allowing any visitor with access to the Detail or List plugin to retrieve another frontend user's profile data, including name, email, date of birth and address, by supplying an arbitrary user ID.
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Analysis
by VulDB Data Team • 08/25/2026
The vulnerability described constitutes a classic Broken Access Control issue, specifically falling under CWE-284: Improper Access Control. This flaw arises from a failure in the application logic to enforce proper authorization checks when handling requests for sensitive user data. In this scenario, the extension's user detail view operates without verifying that the identifier provided in the request corresponds to the authenticated session or the intended target resource. Consequently, an attacker who possesses basic access privileges to either the Detail plugin or the List plugin can manipulate the input parameters to query arbitrary records within the database. This lack of server-side validation allows for unauthorized data retrieval, bypassing any client-side restrictions that might otherwise limit visibility to only one's own profile information.
From a technical perspective, this vulnerability enables an attacker to perform horizontal privilege escalation by accessing resources belonging to peers at the same security level rather than escalating privileges vertically to gain administrative rights. The operational impact is significant as it leads to the exposure of Personally Identifiable Information (PII). By supplying arbitrary user IDs through HTTP requests or API calls, a malicious actor can extract sensitive attributes such as full names, email addresses, dates of birth, and physical addresses. This data leakage not only violates privacy regulations like GDPR but also facilitates further attacks such as phishing campaigns, social engineering, and credential stuffing, where the harvested personal details are used to increase the success rate of subsequent intrusion attempts against victims or their organizations.
In terms of threat modeling, this activity aligns with MITRE ATT&CK technique T1087: Account Discovery, specifically within cloud environments if applicable, or general system enumeration in on-premise setups. The attacker is effectively enumerating user accounts and extracting associated metadata to build a profile for targeted attacks. Furthermore, the ability to retrieve arbitrary records can be categorized under CWE-200: Exposure of Sensitive Information to an Unauthorized Actor. The root cause lies in the absence of robust identity verification mechanisms within the backend logic that processes these requests. Without explicit checks ensuring that the requesting user has ownership or administrative rights over the specific resource being accessed, the application remains vulnerable to mass assignment and unauthorized data access patterns common in modern web applications.
To mitigate this vulnerability, developers must implement strict server-side authorization controls for all endpoints involved in retrieving user details. This involves validating that the authenticated session's identity matches the identifier of the requested resource before processing the query. Implementing role-based access control (RBAC) or attribute-based access control (ABAC) policies can help enforce these boundaries effectively. Additionally, input validation should be applied to ensure that provided identifiers are legitimate and within expected ranges, although this alone is insufficient without proper authorization checks. Logging and monitoring mechanisms should also be enhanced to detect unusual patterns of user data retrieval, such as rapid sequential requests for different user IDs, which may indicate an ongoing enumeration attack. Regular security audits and penetration testing focused on access control flaws will help identify similar weaknesses in other parts of the application before they can be exploited by adversaries.