Vulnerability · Published Oct 25, 2026 · Assigned by VulnCheck

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

Medium 6.8

In plain English

A medium-severity cross-site scripting in siyuan from siyuan-note. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 52% of all known vulnerabilities). Ready-made attack tooling exists: Nuclei.

Severity (CVSS 3.1)6.8Medium

Exploit odds (30 days)0.7%top 48.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack tooling1Nuclei

Official description

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.

Affected products (as reported)

Vendor	Product	Versions
siyuan-note	siyuan	2.9.0 – before 3.8.7

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N

References

GitHub Security Advisory (GHSA-fmj3-xc2f-6w4w) vendor-advisory
VulnCheck Advisory: SiYuan 2.9.0 before 3.8.7 XSS via check-auth to Parameter third-party-advisory