Vulnerability · Published Aug 12, 2026 · Assigned by VulnCheck

CVE-2026-72805SiYuan before v3.7.4 Information Disclosure via Block Endpoints

Medium 5.8

In plain English

A medium-severity missing authorization in siyuan from siyuan-note. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 22% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.8Medium

Exploit odds (30 days)0.3%top 77.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

SiYuan versions before v3.7.4 fail to enforce publish-access checks on getBlockBreadcrumb, getRefText, and getBlockTreeInfos endpoints, allowing disclosure of protected document content and metadata. Anonymous readers or publish RoleReader accounts can retrieve document titles, ancestor block content snippets, reference text, and path metadata for publish-forbidden or password-protected documents by supplying block IDs.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Go	github.com/siyuan-note/siyuan/kernel	0.0.0-20260723163028-931ba693375e	GHSA-67x2-mq63-v9vm
Go	github.com/siyuan-note/siyuan/kernel	0.0.0-20260723163028-931ba693375e	GO-2026-6387

Affected products (as reported)

Vendor	Product	Versions
siyuan-note	siyuan	0 – before 3.7.4

Weakness: CWE-862 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N

References

GitHub Security Advisory (GHSA-67x2-mq63-v9vm) vendor-advisory
VulnCheck Advisory: SiYuan before v3.7.4 Information Disclosure via Block Endpoints third-party-advisory