TI-2026-26718 Aliases CVE-2026-34453 GHSA-c77m-r996-jr3q

Incorrect authorization in siyuan-note siyuan

HIGH 72CWE-863Published 2026-03-31 · Updated 2026-04-01

Key facts

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

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-863.

Summary

SiYuan is a personal knowledge management system. Prior to version 3.6.2, the publish service exposes bookmarked blocks from password-protected documents to unauthenticated visitors. In publish/read-only mode, /api/bookmark/getBookmark filters bookmark results by calling FilterBlocksByPublishAccess(nil, ...). Because the filter treats a nil context as authorized, it skips the publish password check and returns bookmarked blocks from documents configured as Protected. As a result, anyone who can access the publish service can retrieve content from protected documents without providing the required password, as long as at least one block in the document is bookmarked. This issue has been patched in version 3.6.2.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.01227 69th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Fixed siyuan (siyuan-note): 3.6.2github.com/siyuan-note/siyuan/kernel (Go): 3.6.2

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 3.6.2	3.6.2	Patch available	CNA
—	github.com/siyuan-note/siyuan/kernel (Go)	before 3.6.2	3.6.2	Patch available	GHSA-c77m-r996-jr3q

siyuan Vendorsiyuan-note Affected before 3.6.2 Fixed in 3.6.2 Patch available CNA
github.com/siyuan-note/siyuan/kernel (Go) Vendor— Affected before 3.6.2 Fixed in 3.6.2 Patch available GHSA-c77m-r996-jr3q

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:b3log:siyuan::::::::	before 3.6.2	Vulnerable	siyuan-note

cpe:2.3:a:b3log:siyuan:*:*:*:*:*:*:*:* Versions before 3.6.2 Vulnerable ·siyuan-note

Remediation

Fix · CNA siyuan (siyuan-note) Fixed in 3.6.2
Fix · GHSA-c77m-r996-jr3q github.com/siyuan-note/siyuan/kernel (Go) Fixed in 3.6.2 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-34453
2026-10-03 Alias added: GHSA-c77m-r996-jr3q

References

Exploit 1

https://github.com/siyuan-note/siyuan/security/advisories/GHSA-c77m-r996-jr3q

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2026-34453

Other 3

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
TI-2024-35827 A SQL injection vulnerability was discovered in Siyuan 3.1.11 in /getHistoryItems. CVSS 3.1CRITICAL 9.8
TI-2024-35826 A SQL injection vulnerability has been identified in Siyuan 3.1.11 via the ids array parameter in /batchGetBlockAttrs. CVSS 3.1CRITICAL 9.8
TI-2024-35825 A SQL injection vulnerability has been identified in Siyuan 3.1.11 via the id parameter at /getAssetContent. CVSS 3.1CRITICAL 9.8
TI-2024-35824 A SQL injection vulnerability has been identified in Siyuan 3.1.11 via the notebook parameter in /searchHistory. CVSS 3.1CRITICAL 9.8

See all 54 →

Sources

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