Vulnerability · Published Mar 9, 2026 · Assigned by GitHub_M

CVE-2026-30926SiYuan Note publish service authorization bypass allows low-privilege users to modify notebook content

High 7.1

In plain English

A high-severity improper access control 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 28% of all known vulnerabilities).

Severity (CVSS 3.1)7.1High

Exploit odds (30 days)0.3%top 72.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

SiYuan is a personal knowledge management system. Prior to 3.5.10, a privilege escalation vulnerability exists in the publish service of SiYuan Note that allows low-privilege publish accounts (RoleReader) to modify notebook content via the /api/block/appendHeadingChildren API endpoint. The endpoint requires only the model.CheckAuth role, which accepts RoleReader sessions, but it does not enforce stricter checks, such as CheckAdminRole or CheckReadonly. This allows remote authenticated publish users with read-only privileges to append new blocks to existing documents, compromising the integrity of stored notes.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Go	github.com/siyuan-note/siyuan/kernel	no fix listed	GHSA-f9cq-v43p-v523
Go	github.com/siyuan-note/siyuan/kernel	no fix listed	GO-2026-4658

Affected products (as reported)

Vendor	Product	Versions
siyuan-note	siyuan	< 3.5.10

Weakness: CWE-284, CWE-862 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N

References

https://github.com/siyuan-note/siyuan/security/advisories/GHSA-f9cq-v43p-v523 x_refsource_CONFIRM