siyuan-note SiYuan up to 3.8.6 TLS networkServeTLS missing secure attribute

CVSS Meta Temp Score
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CTI Interest Score
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5.2$0-$5k1.20+

Summaryinfo

A vulnerability identified as problematic has been detected in siyuan-note SiYuan up to 3.8.6. This affects an unknown function of the component TLS Handler. Performing a manipulation of the argument networkServeTLS results in missing secure attribute. This vulnerability is known as CVE-2026-116166. Remote exploitation of the attack is possible. No exploit is available. You should upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, was found in siyuan-note SiYuan up to 3.8.6. This affects some unknown functionality of the component TLS Handler. The manipulation of the argument networkServeTLS with an unknown input leads to a missing secure attribute vulnerability. CWE is classifying the issue as CWE-614. The Secure attribute for sensitive cookies in HTTPS sessions is not set, which could cause the user agent to send those cookies in plaintext over an HTTP session. This is going to have an impact on confidentiality. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-116166 since 10/25/2026. The exploitability is told to be difficult. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1539 for this issue.

Upgrading to version 3.8.7 eliminates this vulnerability.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

Name

Version

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 5.2
VulDB Meta Temp Score: 5.2

VulDB Base Score: 3.7
VulDB Temp Score: 3.6
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 6.8
CNA Vector (VulnCheck): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Missing secure attribute
CWE: CWE-614 / CWE-1004 / CWE-732
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: SiYuan 3.8.7

Timelineinfo

10/25/2026 Advisory disclosed
10/25/2026 +0 days CVE reserved
10/25/2026 +0 days VulDB entry created
10/25/2026 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: github.com
Status: Confirmed

CVE: CVE-2026-116166 (🔒)
GCVE (CVE): GCVE-0-2026-116166
GCVE (VulDB): GCVE-100-426225

Entryinfo

Created: 10/25/2026 14:46
Changes: 10/25/2026 14:46 (77)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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