CVE-2026-40318

SiYuan: Publish Reader Path Traversal Delete via `removeUnusedAttributeView`

Published: Apr 16, 2026Updated: Apr 20, 2026 Sources: CVE List NVDCWE-24

8.5HIGH

Description

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.

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:LAttack Complexity

Low

PR:LPrivileges Required

Low

UI:NUser Interaction

None

Scope

S:CScope

Changed

Impact

C:NConfidentiality

None

I:LIntegrity

Low

A:HAvailability

High

Open in CVSS calculator →

Weaknesses

CWE-24

Affected Products

siyuan-note

commercial

siyuanOn-premDesktop App

Consumer Software / productivity

b3log

oss-project

siyuanOn-premWeb App

Web & CMS Plugins / cms-core

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

Is your org exposed to CVE-2026-40318?Request an assessment to establish which checks are appropriate for your systems. Check my exposure

References

https://github.com/siyuan-note/siyuan/security/advisories/GHSA-vw86-c94w-v3x4

github.com

https://github.com/siyuan-note/siyuan/releases/tag/v3.6.4

github.com

Unlock Complete Vulnerability Intelligence

Get the full picture for CVE-2026-40318 and every CVE in our database. Create a free account — no credit card required.

Create Free Account

Plain-language analysis

Impact assessment and exploitation scenario in plain English

Attack graph visualization

Interactive attack path and kill chain mapping

Exploit details & PoC links

ExploitDB, Metasploit, GitHub PoCs with direct links

Nuclei scanner templates

Ready-to-use vulnerability scanner templates

Full remediation guide

Patch instructions, workarounds, and compliance impact

Interactive AI chat

Ask questions about this vulnerability in natural language

Related vulnerabilities

Semantically similar CVEs and attack patterns

REST API & MCP access

Integrate vulnerability data into your workflows