CVE-2026-103085 in User Manager Plugin
Summary
by MITRE • 10/05/2026
Improper Access Control vulnerability in WP User Manager WP User Manager wp-user-manager allows Privilege Abuse.This issue affects WP User Manager: from n/a through 2.9.20.
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Analysis
by VulDB Data Team • 10/05/2026
The identified security flaw within the WP User Manager plugin represents a critical failure in access control mechanisms, specifically categorized under CWE-862 which denotes Missing Authorization checks. This vulnerability allows for privilege abuse by enabling unauthorized users to perform actions that should be restricted to administrators or higher-level roles. The issue stems from insufficient validation of user permissions when processing requests related to user management tasks, such as editing profiles, changing role assignments, or modifying account settings. Because the plugin does not adequately verify whether the initiating request originates from a legitimate administrator with appropriate privileges, attackers can exploit this gap to escalate their own access levels within the WordPress environment.
From an operational perspective, this vulnerability poses a severe risk to the integrity and confidentiality of the hosted web application. An attacker who gains initial foothold through any vector, such as a weak password or cross-site scripting, can leverage this improper access control to elevate privileges without needing additional exploits. This effectively bypasses the intended security boundaries established by WordPress role capabilities. The impact extends beyond simple account compromise; it allows for comprehensive system takeover including data exfiltration, defacement, and installation of persistent backdoors like web shells or malicious plugins. Given that user management is a core function in many WordPress sites, particularly those with membership features or multi-user environments, the potential blast radius is significant as compromised administrative accounts provide full control over content, themes, and installed extensions.
The affected versions span from no specific lower bound through version 2.9.20, indicating that this flaw has persisted across multiple releases if not properly addressed in intermediate updates. This persistence highlights a systemic issue in the development lifecycle where security testing for privilege escalation vectors may have been overlooked or insufficiently rigorous. The vulnerability aligns with MITRE ATT&CK technique T1078 Valid Accounts, specifically focusing on local account manipulation and privilege abuse within cloud environments or web applications. Attackers typically utilize this flaw to maintain persistence and expand their access footprint after initial compromise, making it a pivotal step in the kill chain for many intrusion scenarios targeting WordPress infrastructure.
Mitigation strategies must prioritize immediate remediation through software updates if available from the official repository, ensuring that version 2.9.20 or any subsequent patched release is deployed. In cases where an update is not immediately feasible, administrators should implement strict input validation and server-side authorization checks as a compensating control, although this requires custom development which may introduce new risks. Additionally, enforcing multi-factor authentication for all administrative accounts reduces the likelihood of initial compromise leading to privilege escalation. Regular auditing of user roles and capabilities using security plugins can help detect anomalous permission changes indicative of exploitation attempts. Maintaining up-to-date backups is also essential to facilitate rapid recovery in the event that an attacker successfully exploits this vulnerability before patches are applied.