CVE-2018-1000141 in I
Summary
by MITRE
I, Librarian version 4.9 and earlier contains an Incorrect Access Control vulnerability in ajaxdiscussion.php that can result in any users gaining unauthorized access (read, write and delete) to project discussions.
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Analysis
by VulDB Data Team • 12/05/2025
The vulnerability identified as CVE-2018-1000141 resides within the I, Librarian software ecosystem, specifically affecting versions 4.9 and earlier. This security flaw manifests in the ajaxdiscussion.php component which serves as a critical interface for managing project discussions within the application's collaborative framework. The vulnerability represents a significant access control weakness that fundamentally undermines the application's security model and user privilege management mechanisms.
The technical flaw constitutes an incorrect access control implementation that fails to properly validate user permissions before executing discussion-related operations. When users interact with the ajaxdiscussion.php endpoint, the application does not adequately verify whether the requesting user possesses the necessary authorization levels to perform read, write, or delete actions on project discussions. This deficiency allows any authenticated user to exploit the vulnerability and gain unauthorized access to discussion data that should be restricted to specific user roles or project members. The vulnerability operates at the application logic level, where proper authentication checks are bypassed or inadequately implemented.
The operational impact of this vulnerability extends beyond simple data exposure, as it enables full manipulation of project discussion content. An attacker exploiting this flaw can not only read sensitive discussion threads but also modify or delete them, potentially causing data integrity issues, information leakage, and disruption of collaborative workflows. This access control failure compromises the confidentiality, integrity, and availability of project communication channels, affecting all users within the system who rely on secure discussion forums. The vulnerability particularly impacts organizations that depend on I, Librarian for managing sensitive project information where unauthorized modifications could have significant business and security implications.
This vulnerability maps to CWE-284 which specifically addresses improper access control in software applications, and aligns with ATT&CK technique T1078 which covers valid accounts for unauthorized access. Organizations should implement immediate mitigations including upgrading to versions of I, Librarian that address this access control flaw, implementing additional authentication layers, and conducting thorough access control reviews. System administrators should also consider network segmentation, monitoring for unauthorized access attempts, and regular security assessments to identify similar weaknesses in other components of the application stack. The remediation process should involve comprehensive code review of the access control mechanisms in ajaxdiscussion.php and related endpoints to prevent similar issues from emerging in future releases.