CVE-2026-100640CWE-200information-disclosure

CVE-2026-100640

Medium · published September 26, 2026

CVSS v3.1
4.7
EPSS
0%
Percentile
8.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
4.7 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N
CVSS v4.0
8.6 · CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
EPSS
0.00188 · 8.0th percentile
Weakness
CWE-200 · Exposure of Sensitive Information to an Unauthorized Actor
Published
2026-09-26T18:16Z
References (3)
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-mjmm-hgmc-m7qf · 134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/siyuan-note/siyuan/security/advisories/GHSA-mjmm-hgmc-m7qf · [email protected]https://www.vulncheck.com/advisories/siyuan-before-3.8.4-clipboard-data-disclosure-via-ipc · [email protected]
EPSS history
Timeline
  • 28 SEP 03:25Z
    EPSS moved — → 0%
    epss
  • 26 SEP 13:23Z
    SiYuan before v3.8.4 Clipboard Data Disclosure via IPC
    cvelistv5