CVE-2026-100640

MEDIUM 4.7

SiYuan before v3.8.4 Clipboard Data Disclosure via IPC

CVSS Score

4.7

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-200
Vendor	siyuan-note
Product	siyuan
Published	Sep 26, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

None

Availability

None

Affected Versions

siyuan-note / siyuan

0 < 3.8.4

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/siyuan-note/siyuan/security/advisories/GHSA-mjmm-hgmc-m7qf vulncheck.com: https://www.vulncheck.com/advisories/siyuan-before-3.8.4-clipboard-data-disclosure-via-ipc

Credits

🔍 rexpository