EUVD-2026-83458
GHSA-jfm6-64hf-4hh9
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
Stored payload requires ability to create/inject a notebook name (PR:L) and victim opening the picker (UI:R); Electron+Node.js yields OS command execution, so full C/I/A.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
4DescriptionCVE.org
SiYuan through 3.8.4 renders notebook names as raw HTML in the Daily Note picker dialog without escaping, allowing stored cross-site scripting in the Electron renderer. Attackers can create notebooks with HTML payloads in names that execute JavaScript with Node.js access when the picker opens, enabling operating system command execution.
AnalysisAI
Stored cross-site scripting in SiYuan through 3.8.4 lets an attacker who can set a notebook name containing an HTML payload have that markup rendered unescaped when the Daily Note picker dialog is opened, executing JavaScript inside the Electron renderer where Node.js integration is available and escalating to operating system command execution. Exploitation is gated by two preconditions: the attacker must be able to create or inject a notebook carrying the payload (a shared or synced workspace, a server-mode multi-user deployment, or an imported malicious notebook), and the victim must open the picker; the assessed CVSS 3.1 vector is AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H, while the published CVSS 4.0 score of 8.6 carries PR:N/UI:A, so the two scorings disagree on whether prior privileges are needed. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires (1) the attacker to be able to create or inject a notebook whose name contains an HTML/JavaScript payload - implying a shared/synced workspace, server-mode multi-user deployment, or a maliciously crafted notebook imported by the victim; and (2) the victim to open the Daily Note picker dialog, which triggers the unescaped rendering (UI:A/user interaction is the key limiting factor). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine high-priority issue, not a high-CVSS-but-low-real-risk case, because the impact chain terminates in OS command execution rather than mere client-side script execution. … 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 | No vendor-released patch identifying an exact fixed version is present in the available data, so treat all builds through 3.8.4 as vulnerable and monitor the GitHub advisory GHSA-8c2m-33v9-vvqm (github.com/siyuan-note/siyuan/security/advisories/GHSA-8c2m-33v9-vvqm) for the patched release, upgrading as soon as a build above 3.8.4 is published. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all SiYuan installations and confirm versions (through 3.8.4 are affected), restrict notebook creation and import permissions to trusted administrators only, and instruct users to avoid opening the Daily Note picker until further notice. …
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External POC / Exploit Code
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