All vulnerabilities
CVE-2026-100642GHSA-9gpj-3rm3-x42m

SiYuan v2.1.0 before v3.8.4 Cross-Site Request Forgery via CheckAuth

siyuan-note siyuan
Open in ThreatlineRecord JSON
CVSS
7.2High
ExploitationPublic exploit codeCISA's assessment says proof of concept code is public, assessed 30 Sep 2026. Not in the KEV catalogCISA via CVE List
Exploit odds (EPSS)0.11%Chance of exploitation activity in the next 30 days, higher than 1% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in3.8.4Fixed versionCVE List
Published26 Sep 2026Updated 30 Sep 2026CVE List

What fixes it

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Description

SiYuan versions from v2.1.0 before v3.8.4 contain a cross-site request forgery vulnerability in the CheckAuth lock-screen pass-through branch that grants administrator access to loopback requests without validating Origin headers. Attackers can craft malicious web pages that force victims to terminate the kernel process, read workspace configuration and proxy settings, and trigger administrative actions via zero-credential cross-origin requests from the victim's browser.

Text from CVE List

Affected versions 2

  • siyuanaffected: 2.1.0 before 3.8.4CVE List
  • siyuanunaffected: 3.8.4CVE List

References 2