TI-2026-51015 Aliases CVE-2026-72789 GHSA-v684-q882-jgmq

SiYuan before v3.7.4 Authentication Bypass via Encrypted Notebooks

HIGH 79CWE-862Published 2026-08-12 · Updated 2026-08-14

Key facts

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

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-862.

Summary

SiYuan before v3.7.4 fails to properly validate publish access for encrypted notebooks, treating them as publicly accessible by default. Anonymous readers can enumerate and retrieve fully decrypted document content from unlocked encrypted notebooks through the publish API without authentication or key material.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00369 30th percentileScored 2026-11-07

Fix Fixed siyuan (siyuan-note): 3.7.4github.com/siyuan-note/siyuan/kernel (Go): 0.0.0-20260726020813-a25c2dd06aae

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
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	before 3.7.4	3.7.4	Patch available	CNA
—	github.com/siyuan-note/siyuan/kernel (Go)	before 0.0.0-20260726020813-a25c2dd06aae	0.0.0-20260726020813-a25c2dd06aae	Patch available	GHSA-v684-q882-jgmq

siyuan Vendorsiyuan-note Affected before 3.7.4 Fixed in 3.7.4 Patch available CNA
github.com/siyuan-note/siyuan/kernel (Go) Vendor— Affected before 0.0.0-20260726020813-a25c2dd06aae Fixed in 0.0.0-20260726020813-a25c2dd06aae Patch available GHSA-v684-q882-jgmq

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 3.7.4
Fix · GHSA-v684-q882-jgmq github.com/siyuan-note/siyuan/kernel (Go) Fixed in 0.0.0-20260726020813-a25c2dd06aae Advisory →

Fixed in the same release

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

Release · 2026-08-12
siyuan-note siyuan 3.7.4
21 records Highest priority Priority HIGH 12 HIGH, 4 MEDIUM, 5 LOW
Other records, highest priority first
- TI-2026-51021 SiYuan before v3.7.4 Information Disclosure via Embed BlockPriority HIGH 79
- TI-2026-51020 siyuan before v3.7.4 Session Cookie Key Disclosure via getConfPriority HIGH 79
- TI-2026-51019 SiYuan before v3.7.4 Information Disclosure via /api/system/getConfPriority HIGH 79
Show all 21 records →

Timeline

2026-10-02 Threatist record created from CVE-2026-72789
2026-10-03 Alias added: GHSA-v684-q882-jgmq

References

Advisory 2

Other 2

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