CVE-2026-73239 in Allura
Summary
by MITRE • 08/12/2026
Insecure Direct Object Reference (IDOR) due to missing permission checks for multiple Artifact types in Apache Allura.
This issue affects Apache Allura: before 1.19.1.
Users are recommended to upgrade to version 1.19.1, which fixes the issue.
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Analysis
by VulDB Data Team • 08/12/2026
Insecure Direct Object Reference vulnerabilities represent a critical class of security flaws that occur when applications fail to properly validate user permissions before granting access to resources. This weakness allows attackers to directly manipulate object references such as database keys, file paths, or API endpoints to gain unauthorized access to data they should not be able to view or modify. The vulnerability manifests when an application uses direct object references without implementing proper authorization checks, enabling malicious actors to bypass normal access controls and potentially access sensitive information or perform unauthorized operations across various artifact types within the system.
The specific vulnerability in Apache Allura affects versions prior to 1.19.1 where multiple artifact types lack proper permission validation mechanisms. This includes but is not limited to project artifacts, issue tracking items, wiki pages, and repository contents that are accessible through direct object references without adequate authorization checks. The flaw allows authenticated users to potentially access artifacts belonging to other users or projects when they should be restricted from doing so. This represents a fundamental breakdown in the application's access control model where the system fails to verify whether the requesting user has legitimate permissions to access specific objects.
The operational impact of this vulnerability extends beyond simple data exposure, as it can enable broader exploitation patterns that align with attack techniques documented in the MITRE ATT&CK framework under the privilege escalation and defense evasion categories. An attacker could leverage this weakness to perform reconnaissance across multiple projects, access confidential information, or potentially modify artifacts in ways that compromise system integrity. The vulnerability affects the core functionality of Allura's artifact management system where users can directly reference objects through URLs or API calls without proper validation of their authorization level.
From a technical perspective this issue corresponds to CWE-284 which specifically addresses insufficient access control and weak access control mechanisms. The root cause stems from inadequate implementation of object-level security checks within the application's resource access layer, creating pathways for unauthorized access that bypass standard authentication flows. Organizations using affected versions of Apache Allura face significant risk exposure where attackers could systematically enumerate and access resources they should not have permission to view, potentially leading to data breaches or system compromise.
The recommended mitigation strategy involves upgrading to Apache Allura version 1.19.1 which implements proper permission validation checks for all artifact types. This upgrade addresses the core authorization flaw by ensuring that each object reference is validated against the user's permissions before granting access. Security teams should also perform thorough audits of their existing Allura installations to verify that no other systems are running vulnerable versions, while implementing additional monitoring for suspicious access patterns that might indicate exploitation attempts.
Organizations should consider implementing additional defensive measures such as web application firewalls, access logging with detailed audit trails, and regular security assessments to detect potential misuse of the system. The vulnerability demonstrates the critical importance of proper access control implementation in collaborative platforms where multiple users interact with shared resources, emphasizing the need for robust authorization mechanisms that prevent unauthorized object access regardless of how the reference is obtained.