CVE-2026-30926
SiYuan Note publish service authorization bypass allows low-privilege users to modify notebook content
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.
INFO
Published Date :
March 10, 2026, 7:44 a.m.
Last Modified :
March 13, 2026, 5:06 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | MITRE-CVE | ||||
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Update SiYuan Note to version 3.5.10 or later.
- Ensure publish service roles have proper permissions.
- Limit access to the API endpoint.
- Review access control for sensitive endpoints.
Public PoC/Exploit Available at Github
CVE-2026-30926 has a 1 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-30926.
| URL | Resource |
|---|---|
| https://github.com/siyuan-note/siyuan/security/advisories/GHSA-f9cq-v43p-v523 | Exploit Vendor Advisory |
| https://github.com/siyuan-note/siyuan/security/advisories/GHSA-f9cq-v43p-v523 | Exploit Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-30926 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-30926
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
whoami
zwique
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-30926 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-30926 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Mar. 13, 2026
Action Type Old Value New Value Added CWE CWE-862 Added CPE Configuration OR *cpe:2.3:a:b3log:siyuan:*:*:*:*:*:*:*:* versions up to (excluding) 3.5.10 Added Reference Type GitHub, Inc.: https://github.com/siyuan-note/siyuan/security/advisories/GHSA-f9cq-v43p-v523 Types: Exploit, Vendor Advisory Added Reference Type CISA-ADP: https://github.com/siyuan-note/siyuan/security/advisories/GHSA-f9cq-v43p-v523 Types: Exploit, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Mar. 10, 2026
Action Type Old Value New Value Added Reference https://github.com/siyuan-note/siyuan/security/advisories/GHSA-f9cq-v43p-v523 -
New CVE Received by [email protected]
Mar. 10, 2026
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N Added CWE CWE-284 Added CWE CWE-862 Added Reference https://github.com/siyuan-note/siyuan/security/advisories/GHSA-f9cq-v43p-v523