CVE-2026-101091
Deferred Deferred - Pending Action

SiYuan Block Query SQL Injection Before v3.8.4

Publication date: 2026-09-28

Last updated on: 2026-09-28

Assigner: VulnCheck

Description
SiYuan versions before v3.8.4 fail to properly validate SQL statements in block query embed blocks executed against siyuan.db. Attackers can craft malicious .sy documents with non-read-only SQL statements that execute automatically during background indexing, rendering, or export operations without authentication.

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Meta Information

Published
2026-09-28
Last Modified
2026-09-28
Generated
2026-09-29
AI Q&A
2026-09-29
EPSS Evaluated
N/A
NVD
CVE-2026-101091

Affected Vendors & Products

Currently, no data is known.

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-89 The product constructs all or part of an SQL command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended SQL command when it is sent to a downstream component. Without sufficient removal or quoting of SQL syntax in user-controllable inputs, the generated SQL query can cause those inputs to be interpreted as SQL instead of ordinary user data.

Attack-Flow Graph

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Executive Summary

SiYuan versions before v3.8.4 have a flaw where SQL statements in block query embed blocks are not properly validated against siyuan.db. Attackers can create malicious .sy files with non-read-only SQL that executes automatically during background operations like indexing, rendering, or exporting without requiring authentication.

Impact Analysis

This vulnerability allows attackers to execute unauthorized SQL commands on your SiYuan database. This could lead to data theft, modification, or deletion without your knowledge or consent. Since it triggers during background processes, you may not notice the attack until damage is done.

Compliance Impact

This vulnerability could violate compliance requirements like GDPR (data protection) or HIPAA (health data security) by enabling unauthorized access to sensitive data. Organizations may face legal penalties, reputational damage, and loss of trust if such breaches occur due to unpatched software.

Mitigation Strategies

Upgrade SiYuan to version v3.8.4 or later to address the improper SQL validation issue in block query embed blocks.

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