siyuan-note SiYuan up to 3.8.1 Clipboard Paste Handler injection

CVSS Meta Temp Score
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CTI Interest Score
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7.4$0-$5k0.40+

Summaryinfo

A vulnerability was found in siyuan-note SiYuan up to 3.8.1. It has been classified as critical. This affects the function Paste Handler of the component Clipboard. This manipulation causes injection. This vulnerability is registered as CVE-2026-86712. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability has been found in siyuan-note SiYuan up to 3.8.1 and classified as critical. Affected by this vulnerability is the function Paste Handler of the component Clipboard. The manipulation with an unknown input leads to a injection vulnerability. The CWE definition for the vulnerability is CWE-74. The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

SiYuan before 3.8.2 trusts the attacker-writable text/siyuan clipboard MIME type and skips sanitization in the paste handler, allowing code execution in the Node-enabled desktop renderer. Attackers can craft malicious web pages that write to the clipboard, and when pasted into SiYuan, injected scripts execute with full Node.js access through the Electron main process.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-86712 since 09/08/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1055 according to MITRE ATT&CK.

Upgrading to version 3.8.2 eliminates this vulnerability.

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Productinfo

Vendor

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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: 7.6
VulDB Meta Temp Score: 7.4

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 8.8
CNA Vector (VulnCheck): 🔒

CVSSv2info

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

Exploitinginfo

Class: Injection
CWE: CWE-74 / CWE-707 / CWE-20
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 3.8.2

Timelineinfo

09/08/2026 Advisory disclosed
09/08/2026 +0 days CVE reserved
09/08/2026 +0 days VulDB entry created
09/08/2026 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: github.com
Status: Confirmed

CVE: CVE-2026-86712 (🔒)
GCVE (CVE): GCVE-0-2026-86712
GCVE (VulDB): GCVE-100-399775

Entryinfo

Created: 09/08/2026 13:36
Changes: 09/08/2026 13:36 (77)
Complete: 🔍
Cache ID: 216::103

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