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CVE-2026-74798

8.7 · HIGH

SiYuan kernel before v3.7.4 contains a path traversal vulnerability in the database_clean MCP tool.

Published Aug 17, 2026CWE-22EPSS 0.51%

Overview

CVE-2026-74798 is a high-severity vulnerability. It was published on August 17, 2026 and has a CVSS 3.1 base score of 8.7 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.7, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

SiYuan kernel before v3.7.4 contains a path traversal vulnerability in the database_clean MCP tool. The tool performs only an empty-string check on the id parameter before passing it to RemoveUnusedAttributeView (kernel/model/attribute_view.go), which builds a filesystem path via filepath.Join without validating that id matches SiYuan's node-ID format. An authenticated MCP client can supply path traversal sequences in id to cause the kernel to copy an arbitrary file readable by the process into SiYuan's history directory (arbitrary file read) and then delete the original file (arbitrary file deletion). The corresponding HTTP API handler was hardened in GHSA-7hm9-v7vf-7g4w, but this MCP caller was not.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/siyuan-note/siyuan/security/advisories/GHSA-43jx-gxq4-jpjcRefwww.vulncheck.com/advisories/siyuan-kernel-path-traversal-via-database-clean-mcp-toolGitHubgithub.com/siyuan-note/siyuan/security/advisories/GHSA-43jx-gxq4-jpjc

How CyberStrike helps

Frequently asked questions

What is CVE-2026-74798?

CVE-2026-74798 is a high-severity vulnerability. It was published on August 17, 2026 and has a CVSS 3.1 base score of 8.7 (HIGH).

How severe is CVE-2026-74798?

This vulnerability has a CVSS 3.1 base score of 8.7, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-74798?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-74798?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-74798 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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