TI-2026-64798 Aliases CVE-2026-100638 GHSA-6gvc-7gr4-55rh

SiYuan before v3.8.4 Path Traversal via setNotebookIcon

HIGH 69CWE-73Published 2026-09-26 · Updated 2026-09-30

Key facts

Attack vector: Network
Privileges required: High
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: —
Confidentiality · integrity · availability: None · High · Low
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

SiYuan versions before v3.8.4 contain a path traversal vulnerability in the setNotebookIcon endpoint that allows authenticated administrators to create arbitrary directory trees and write files outside the workspace boundary. Attackers can supply directory traversal sequences in the notebook parameter to escape the workspace data directory and write conf.json files to arbitrary locations accessible by the kernel process.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00553 46th percentileScored 2026-11-07

Fix Fixed siyuan (siyuan-note): 3.8.4

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
siyuan-note	siyuan	before 3.8.4	3.8.4	Patch available	CNA

siyuan Vendorsiyuan-note Affected before 3.8.4 Fixed in 3.8.4 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:b3log:siyuan::::::::	—	—	siyuan-note

cpe:2.3:a:b3log:siyuan:*:*:*:*:*:*:*:* Versions — — ·siyuan-note

Remediation

Fix · CNA siyuan (siyuan-note) Fixed in 3.8.4

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Release · 2026-09-26
siyuan-note siyuan 3.8.4
14 records Highest priority Priority HIGH 11 HIGH, 2 MEDIUM, 1 LOW
Other records, highest priority first
- TI-2026-64804 SiYuan before v3.8.4 SQL Injection via dailyNoteSavePathPriority HIGH 77
- TI-2026-64806 SiYuan before v3.8.4 Authentication Bypass via Missing Origin HeaderPriority HIGH 72
- TI-2026-64805 SiYuan 3.7.0 before 3.8.4 Stored XSS via Gallery KanbanPriority HIGH 72
Show all 14 records →

Timeline

2026-10-02 Threatist record created from CVE-2026-100638
2026-10-03 Alias added: GHSA-6gvc-7gr4-55rh

References

Advisory 1

GitHub Security Advisory (GHSA-6h8x-6mph-7438)

TI-2026-48492 SiYuan before v3.7.3 SQL Injection via searchDocs CVSS 4.0CRITICAL 9.9
TI-2026-48491 SiYuan before v3.7.3 SQL Injection via searchEmbedBlock CVSS 4.0CRITICAL 9.9
TI-2026-48490 SiYuan before v3.7.3 SQL Injection via fullTextSearchAssetContent CVSS 4.0CRITICAL 9.9
TI-2026-47010 SiYuan before v3.7.2 Unauthenticated Administrator Takeover via MCP CVSS 4.0CRITICAL 10.0
TI-2026-26050 SiYuan has directory traversal within its publishing service CVSS 3.1CRITICAL 9.8
TI-2026-25256 SiYuan: Authorization Bypass Allows Arbitrary SQL Execution via Search API CVSS 3.1CRITICAL 9.8

See all 242 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences