TI-2026-71125 Aliases CVE-2026-109309 GHSA-g3cr-c99q-2hfc

Arbitrary file read in SiYuan via plugin response file path

LOW 37CWE-22Published 2026-10-12 · Updated 2026-10-13

Key facts

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

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-22 and the CVSS impact.

Summary

SiYuan from 3.7.0 before 3.8.6 has an absolute path traversal flaw (CWE-22) in its private kernel plugin HTTP server, which passes a plugin handler's response file path to gin without validation. An attacker who supplies a malicious kernel plugin can return an absolute path and read any file the SiYuan process can read, including the API token and conf.json.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

SiYuan v3.7.0 before v3.8.6 contains an absolute path traversal vulnerability in the kernel's private plugin HTTP server, which passes a kernel plugin handler's ResponseFile.Path to gin's Context.File without validation. Attackers supplying a malicious kernel plugin can return an absolute path to read any file readable by the SiYuan process, including the API token and conf.json.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00381 32nd percentileScored 2026-11-07

Fix Fixed siyuan (siyuan-note): 3.8.6

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
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	3.7.0 to before 3.8.6	3.8.6	Patch available	CNA

siyuan Vendorsiyuan-note Affected 3.7.0 to before 3.8.6 Fixed in 3.8.6 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

Upgrade SiYuan to version 3.8.6, the fixed version for the affected range from 3.7.0 before 3.8.6.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Fix · CNA siyuan (siyuan-note) Fixed in 3.8.6

Fixed in the same release

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

Release · 2026-10-12
siyuan-note siyuan 3.8.6
2 records Highest priority Priority MEDIUM 1 MEDIUM, 1 LOW
Other records, highest priority first
- TI-2026-71126 Denial of service in SiYuan through getDynamicIcon templatePriority MEDIUM 64
Show all 2 records →

Timeline

2026-10-12 Threatist record created from CVE-2026-109309
2026-10-12 Alias added: GHSA-g3cr-c99q-2hfc
2026-10-13 Priority changed: MEDIUM → LOW
2026-10-13 CISA SSVC decision points changed

References

Patch 1

Patch Commit

Advisory 1

GitHub Security Advisory (GHSA-phmw-4rgv-r4xv)

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