CVE-2026-95590 in Tainacan Plugin
Summary
by MITRE • 09/23/2026
Subscriber SQL Injection in Tainacan <= 1.2.0 versions.
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Analysis
by VulDB Data Team • 09/23/2026
The vulnerability identified as a subscriber-level SQL injection flaw within Tainacan versions prior to 1.2.0 represents a critical security deficiency that allows unauthenticated or low-privileged users to interact directly with the underlying database management system. This type of attack vector exploits improper input validation and sanitization mechanisms in the application code, specifically targeting endpoints associated with subscriber data handling. In web applications like Tainacan, which manages digital collections and metadata, user inputs are frequently passed into SQL queries without adequate filtering for special characters or malicious payloads. When these inputs are concatenated directly into query strings rather than being handled through parameterized statements or prepared statements, the database engine may interpret injected code as part of the legitimate command structure. This fundamental architectural flaw enables an attacker to manipulate the logic of SQL queries, potentially bypassing authentication controls, extracting sensitive data such as user credentials and collection metadata, modifying existing records, or even executing administrative commands depending on the privileges assigned to the database account used by the application.
From a technical perspective, this vulnerability aligns with CWE-89, which defines Improper Neutralization of Special Elements used in an SQL Command, commonly known as SQL Injection. The exploitation typically involves crafting specific HTTP requests where query parameters contain syntactically correct SQL fragments designed to alter the intended outcome of the database operation. For instance, an attacker might append a conditional statement or a union-based payload to retrieve data from other tables within the same schema that are not normally accessible through the user interface. Because this vulnerability exists at the subscriber level, it is particularly dangerous as it does not require high-level administrative privileges to initiate. This lowers the barrier for entry significantly, allowing any registered user with minimal access rights to potentially compromise the integrity and confidentiality of the entire system. The impact extends beyond simple data theft; successful exploitation can lead to complete server takeover if the database service runs with elevated permissions or is configured to allow operating system command execution through functions like xp_cmdshell in Microsoft SQL Server or similar capabilities in other database engines.
The operational impact of this vulnerability is severe, affecting both the confidentiality and integrity aspects of information security for organizations relying on Tainacan for digital preservation and access control. Unauthorized data extraction can result in the exposure of personally identifiable information if subscriber profiles contain such details, leading to potential regulatory violations under frameworks like GDPR or CCPA depending on jurisdictional requirements. Furthermore, the ability to modify database records undermines the trustworthiness of the archival system, potentially allowing attackers to alter collection metadata, delete critical assets, or inject malicious content that could be served to other users upon retrieval. This compromises the core mission of digital libraries and archives which rely on data integrity for historical accuracy and legal compliance. Additionally, persistent backdoors installed via SQL injection can lead to long-term unauthorized access, facilitating further lateral movement within an organization's network infrastructure if the database server is accessible from internal networks or has exposed services that can be pivoted through.
Mitigation strategies must focus primarily on upgrading the Tainacan installation to version 1.2.0 or later where this specific flaw has been addressed by developers implementing robust input validation and secure coding practices. In addition to software updates, defensive measures should include deploying Web Application Firewalls configured with rulesets capable of detecting and blocking common SQL injection patterns in HTTP requests. Database access controls must be strictly enforced following the principle of least privilege, ensuring that the application account used for database connections has only the necessary permissions required for its function, thereby limiting the potential damage even if an injection succeeds. Regular security audits and static code analysis tools should be integrated into the development lifecycle to identify similar vulnerabilities in custom plugins or themes associated with Tainacan. Monitoring logs for anomalous query patterns can also aid in early detection of exploitation attempts, allowing incident response teams to react before significant data loss occurs. This vulnerability is categorized under ATT&CK technique T1190, Exploit Public-Facing Application, highlighting the risk posed by vulnerabilities accessible through internet-facing interfaces that lack proper input sanitization mechanisms.