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CVE-2026-40259 - Vulnerability Analysis

HighCVSS: 8.1

Last Updated: April 16, 2026

SiYuan - Broken Access Control

Published: April 16, 2026Updated: April 16, 2026Remote Exploitable

Overview

SiYuan <= 3.6.3 contains an arbitrary file deletion vulnerability caused by insufficient authorization in /api/av/removeUnusedAttributeView endpoint, letting authenticated publish-service RoleReader users delete attribute view files, exploit requires authentication with RoleReader token.

Severity & Score

Severity: High

CVSS Score: 8.1

Impact

Authenticated attackers can delete arbitrary attribute view files, causing database view breakage and workspace rendering issues.

Mitigation

Update to version 3.6.4 or later.

References

https://github.com/siyuan-note/siyuan/releases/tag/v3.6.4
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-7m5h-w69j-qggg

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Details

CVE ID: CVE-2026-40259
Severity: High
CVSS Score: 8.1
Type: broken_access_control
Status: new

CWE

CWE-285

CVSS Metrics

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H