EUVD-2026-72688
GHSA-358r-j9r9-9hv6
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-delivered via malicious page, no privileges required, single paste action constitutes UI:R, and Node.js renderer access constitutes a scope change to the underlying OS (S:C).
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
5DescriptionCVE.org
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.
Articles & Coverage 2
AnalysisAI
Remote code execution in SiYuan desktop before 3.8.2 allows an unauthenticated network attacker to achieve full Node.js-level system access by poisoning a victim's clipboard from a malicious web page. The paste handler in app/src/protyle/util/paste.ts treated the custom text/siyuan clipboard MIME type as implicitly trusted internal content and skipped HTML sanitization before rendering, and a secondary code path used a same-origin hidden iframe to parse large HTML blobs, permitting inline script execution. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The victim must be running the SiYuan Electron desktop application (any platform: Windows, macOS, or Linux) in a version prior to 3.8.2 with Node.js integration active in the renderer, which is the default configuration of all desktop releases. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 8.6 (AV:N/AC:L/AT:N/PR:N/UI:A) accurately reflects the primary friction point: a single explicit paste action is required from the victim. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade SiYuan desktop to version 3.8.2 or later, available at https://github.com/siyuan-note/siyuan/releases/tag/v3.8.2. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all SiYuan desktop installations across your organization and identify current versions in use, prioritizing systems belonging to engineers, researchers, and users with elevated privileges. …
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External POC / Exploit Code
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