CVE-2026-72807 in SiYuan
Summary
by MITRE • 08/12/2026
SiYuan versions before v3.7.4 contain a second-order SQL injection vulnerability in attribute-view template columns that expose the queryBlocks function, which executes raw SQL using string substitution instead of parameterized queries. Attackers can distribute malicious SiYuan documents or packages with crafted template columns that execute arbitrary SQL on a victim's kernel when the package is imported and rendered, enabling read and write access across notebooks.
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Analysis
by VulDB Data Team • 08/12/2026
This vulnerability exists within the SiYuan note-taking application where versions prior to v3.7.4 fail to properly sanitize user input in attribute-view template columns. The flaw specifically manifests in the queryBlocks function which processes raw SQL queries through string substitution rather than utilizing parameterized query mechanisms. This design decision creates a second-order sql injection vulnerability that allows attackers to inject malicious sql code into template columns that are later executed when documents are imported and rendered. The vulnerability is particularly dangerous because it operates at the kernel level where the application processes and executes these templates, giving attackers elevated privileges to access and manipulate data across all notebooks within the system.
The technical exploitation occurs through crafted malicious SiYuan documents or packages that contain specially constructed template columns designed to inject sql commands when processed by the vulnerable queryBlocks function. When a victim imports such a package, the application's rendering engine processes these templates and executes the embedded sql code directly against the underlying database without proper input validation or sanitization. This allows attackers to perform read operations to extract sensitive data from notebooks, write operations to modify or delete content, and potentially execute additional commands that could compromise the entire system. The second-order nature of this vulnerability means that the malicious payload is not immediately executed but rather stored within the template structure and only activated during document rendering or query processing.
The operational impact of this vulnerability extends beyond simple data theft as it provides attackers with persistent access to all notebook data across different users and contexts within the SiYuan environment. This type of vulnerability falls under CWE-89 which specifically addresses sql injection flaws, and aligns with ATT&CK technique T1074.001 for data staging through database queries. The attack vector leverages the application's legitimate document import functionality to deliver malicious payloads, making it particularly difficult to detect and prevent through standard network monitoring or firewall rules. Once successfully exploited, attackers can establish long-term access to sensitive information stored in notebooks, potentially compromising intellectual property, personal data, or confidential business information.
Mitigation strategies should focus on implementing proper input validation and parameterized query execution throughout the SiYuan application, particularly within the attribute-view template processing components. The most effective immediate solution involves upgrading to SiYuan version 3.7.4 or later where the vulnerability has been patched through proper sql query sanitization and parameter binding mechanisms. Additionally, administrators should implement strict document import policies that require verification of package authenticity and content inspection before allowing imports. Network-based protections such as database query monitoring and anomaly detection systems can help identify suspicious sql execution patterns, while application-level restrictions on template column processing should be enforced to prevent arbitrary code injection. The vulnerability demonstrates the critical importance of secure coding practices in database interactions and highlights the need for comprehensive input validation at all layers of application processing to prevent second-order injection attacks that can persist across multiple system operations.