Medium 6.8Published Oct 25, 2026

CVE-2026-116167SiYuan 2.9.0 before 3.8.7 XSS via check-auth to Parameter

Updated under an hour ago (Oct 28, 2026, 7:50 AM ET)

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Every CVE for siyuan-note siyuan

Exploited in the last 30 days

SiYuan from 2.9.0 before 3.8.7 contains a cross-site scripting vulnerability in the unauthenticated /check-auth page that assigns the to parameter to window.location.href without scheme validation. Attackers can send a crafted link with a javascript: URI that executes after victim login, invoking kernel APIs to read or modify workspace content and settings.

CVSS: 6.8 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
Weakness (CWE): CWE-79
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulnCheck
NVD analysis: Deferred
Record last updated: Oct 26, 2026
First seen by InfoSec Signals: Oct 25, 2026

Affected products

Affected products

siyuan-note siyuan siyuan_note:siyuan (from the name)	from 2.9.0 before 3.8.7; 3.8.7 not affected	CNA record

References

References

https://github.com/siyuan-note/siyuan/security/advisories/GHSA-fmj3-xc2f-6w4w	vendor-advisory
https://www.vulncheck.com/advisories/siyuan-2.9.0-before-3.8.7-xss-via-check-auth-to-parameter	third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.