Is CVE-2026-40259 actively exploited?

No active exploitation of CVE-2026-40259 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-40259 be exploited remotely?

Yes. CVE-2026-40259 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-40259?

CVE-2026-40259 has a CVSS score of 8.1 (HIGH).

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HIGH

CVE-2026-40259

CWE-285Published: April 16, 2026· Updated: Apr 20, 2026

8.1

CVSS v3.1

EPSS:0.03%probability of exploitation in 30 daysPercentile:7.2th

Official 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.

NVD Source

Technical Analysis

CVE-2026-40259 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 8.1.