CVE-2026-56093 in Apache Solr for TYPO3
Summary
by MITRE • 08/25/2026
The extension's frontend detail-view document lookup does not apply the current site's siteHash filter or frontend user access filter, unlike the regular search path. A visitor who can obtain or guess a valid Solr document id can retrieve documents through this lookup without the same access restrictions enforced elsewhere.
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Analysis
by VulDB Data Team • 08/25/2026
The identified vulnerability represents a critical authorization bypass within the TYPO3 extension's frontend detail-view mechanism, specifically affecting how external identifiers are resolved against backend data stores. The core technical flaw lies in the inconsistent application of security filters when processing document lookups via direct identifier resolution compared to standard search queries. While regular search paths correctly enforce site-specific hashing constraints and frontend user group access controls, this specific lookup endpoint fails to validate these prerequisites before retrieving content from the Solr index. This discrepancy creates a significant gap in the defense-in-depth strategy employed by the application, allowing unauthenticated or unauthorized visitors to bypass intended access restrictions simply by possessing or guessing a valid document identifier.
From a technical perspective, the vulnerability stems from an incomplete implementation of security checks within the detail-view controller logic. When a user initiates a search through standard channels, the system iteratively applies filters based on the current site context and the authenticated frontend user's permissions to ensure data isolation. However, when a direct document ID is passed for lookup, the code path bypasses these validation steps, assuming that the identifier itself implies permission or relying solely on backend-level checks that may not be synchronized with frontend access policies in this specific context. This oversight allows an attacker to retrieve sensitive documents that should remain hidden from public view or restricted to specific user groups, effectively treating private data as publicly accessible if the unique ID is known.
The operational impact of this vulnerability is severe, primarily due to its potential for information disclosure and unauthorized data access. An adversary who can enumerate valid document IDs through methods such as directory traversal, log analysis, or simple sequential guessing can extract confidential content without any authentication credentials. This undermines the integrity of the application's role-based access control model and exposes proprietary or personal information that was intended to be protected by siteHash verification and frontend user filters. In environments where sensitive documents are stored in Solr, this flaw could lead to significant compliance violations regarding data privacy regulations such as GDPR or HIPAA, depending on the nature of the exposed content.
This vulnerability aligns with CWE-284 Improper Access Control, specifically illustrating a failure to enforce proper authorization checks for specific API endpoints or view handlers within an application. Furthermore, it maps directly to MITRE ATT&CK technique T1078 Valid Accounts and potentially T1539 Steal Web Session Cookie if the bypass allows access to session-dependent data, although in this case, it is more accurately described as a direct authorization bypass where valid credentials are not required due to flawed logic. The lack of consistent filtering across different entry points for similar resources highlights a systemic issue in how security policies are translated into code paths within the extension's architecture.
To mitigate this vulnerability, developers must ensure that all data retrieval endpoints enforce identical access control checks regardless of the input method used to identify the resource. This involves explicitly applying siteHash validation and frontend user group permission checks within the detail-view lookup logic before querying the Solr index or returning document details. Implementing a centralized authorization service or middleware that validates these permissions for all content requests can prevent such inconsistencies. Additionally, implementing rate limiting on ID-based lookups and avoiding predictable identifier formats can reduce the risk of enumeration attacks. Regular security audits focusing on access control consistency across different application pathways are essential to identify and remediate similar logic flaws in complex web applications.