All vulnerabilities
CVE-2026-100640GHSA-mjmm-hgmc-m7qf

SiYuan before v3.8.4 Clipboard Data Disclosure via IPC

siyuan-note siyuan
Open in ThreatlineRecord JSON
CVSS
8.6High
ExploitationPublic exploit codeCISA's assessment says proof of concept code is public, assessed 28 Sep 2026. Not in the KEV catalogCISA via CVE List
Exploit odds (EPSS)0.19%Chance of exploitation activity in the next 30 days, higher than 8% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in3.8.4Fixed versionCVE List
Published26 Sep 2026Updated 8 Oct 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 before v3.8.4 contains an authorization omission in the siyuan-get IPC handler that allows remote-kernel renderers to access native clipboard formats by invoking clipboardReadMathML, clipboardReadOffice, and clipboardReadWPS commands with matching plaintext. Attackers controlling remote renderer content can obtain MathML formulas, Office bytes, and WPS bytes from local clipboard during user-mediated paste operations.

Text from CVE List

Affected versions 2

  • siyuanaffected: all versions before 3.8.4CVE List
  • siyuanunaffected: 3.8.4CVE List

References 2