Medium severity · published Oct 25, 2026
CVE-2026-116167
SiYuan 2.9.0 before 3.8.7 XSS via check-auth to Parameter
New
6.8
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 16% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SI
siyuan · siyuan-note
2.9.0 before 3.8.7 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-116167
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-116167
github.com
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-fmj3-xc2f-6w4w
www.vulncheck.com
https://www.vulncheck.com/advisories/siyuan-2.9.0-before-3.8.7-xss-via-check-auth-to-parameter
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