CVE-2026-100642CWE-346

CVE-2026-100642

High · published September 26, 2026

CVSS v3.1
7.6
EPSS
0%
Percentile
1.1
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.6 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H
CVSS v4.0
7.2 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N
EPSS
0.00107 · 1.1th percentile
Weakness
CWE-346 · Origin Validation Error
Published
2026-09-26T18:16Z
References (3)
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-9gpj-3rm3-x42m · [email protected]https://www.vulncheck.com/advisories/siyuan-2.1.0-before-3.8.4-cross-site-request-forgery-via-checkauth · [email protected]https://github.com/siyuan-note/siyuan/security/advisories/GHSA-9gpj-3rm3-x42m · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 28 SEP 03:25Z
    EPSS moved — → 0%
    epss
  • 26 SEP 13:23Z
    SiYuan v2.1.0 before v3.8.4 Cross-Site Request Forgery via CheckAuth
    cvelistv5