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CVE-2026-40259

SiYuan: Publish Reader Can Arbitrarily Delete Attribute View Files via removeUnusedAttributeView API

Published: Apr 16, 2026Updated: Apr 20, 2026 Sources: CVE List NVDCWE-285
NVD MITRE
8.1CVSSHIGH
EPSS Score
0.4%
Top 68.4%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

Description

SiYuan is an open-source personal knowledge management system. In versions 3.6.3 and below, the /api/av/removeUnusedAttributeView endpoint is protected only by generic authentication that accepts publish-service RoleReader tokens. The handler passes a caller-controlled id directly to a model function that unconditionally deletes the corresponding attribute view file from the workspace without verifying that the caller has write privileges or that the target attribute view is actually unused. An authenticated publish-service reader can permanently delete arbitrary attribute view definitions by extracting publicly exposed data-av-id values from published content, causing breakage of database views and workspace rendering until manually restored. This issue has been fixed in version 3.6.4.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:NI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-285

Affected Products

siyuansiyuan-note
siyuanb3log
On-premWeb App
Web & CMS Plugins / cms-core
b3logoss-projectWeb & CMS Pluginsaka b3log

Exploitability

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

References

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

Timeline

Published
Apr 16, 2026
Last Updated
Apr 20, 2026

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