CVE-2026-40318: SiYuan: Publish Reader Path Traversal Delete via `removeUnusedAttributeView`
SiYuan is an open-source personal knowledge management system. In versions 3.6.3 and prior, the /api/av/removeUnusedAttributeView endpoint constructs a filesystem path using the user-controlled id parameter without validation or path boundary enforcement. An attacker can inject path traversal sequences such as ../ into the id value to escape the intended directory and delete arbitrary .json files on the server, including global configuration files and workspace metadata. This issue has been fixed in version 3.6.4.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-40318?
CVE-2026-40318 has a medium severity due to its potential for unauthorized file access.
How do I fix CVE-2026-40318?
To fix CVE-2026-40318, update SiYuan to version 3.6.4 or later.
What does CVE-2026-40318 affect?
CVE-2026-40318 affects SiYuan versions up to and including 3.6.3.
What type of vulnerability is CVE-2026-40318?
CVE-2026-40318 is a path traversal vulnerability related to the removeUnusedAttributeView function.
Can CVE-2026-40318 lead to data loss?
Yes, exploitation of CVE-2026-40318 could lead to unintended file deletions.