Medium severity · published Oct 25, 2026
CVE-2026-116166
SiYuan 3.6.0 before 3.8.7 Cleartext Transmission via Unenforced networkServeTLS Setting
New
6.8
CVSS
0.1%
EPSS
No
On KEV
Description
SiYuan 3.6.0 before 3.8.7 accepts and persists the networkServeTLS setting but never enforces it, so the kernel port keeps serving full API access over plain HTTP alongside HTTPS. Network-adjacent attackers can sniff the cleartext login flow and session cookie, which lacks the Secure attribute while responses omit HSTS, to hijack kernel API sessions.
CVSS vector
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Attack vector
Adjacent
Complexity
High
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 2% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SI
siyuan · siyuan-note
3.6.0 before 3.8.7 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-116166
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-116166
github.com
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-hpj5-f7cj-vvwr
www.vulncheck.com
https://www.vulncheck.com/advisories/siyuan-3.6.0-before-3.8.7-cleartext-transmission-via-unenforced-networkservetls-setting
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