CVE-2026-30926
HIGH EPSS 22.8%
Published Mar 10, 20263mo ago · Modified Jun 17, 20262w ago
7.1 CVSS 3.1
Published Mar 10, 2026 3mo ago
Last Modified Jun 17, 2026 2w ago
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.
CVSS Details
Base Score
Exploitability
Impact
Vector string
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N Attack Vector Network
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality Low
Integrity High
Availability None
Threat Intelligence
EPSS Exploit Probability
22.8% percentile
Exploit & Patch Status
Public Exploit Known
No Patch Available
Weaknesses 2
CWE-284
CWE-862 Missing Authorization Authorization
Affected Products 1
| Vendor | Product | Version | Range |
|---|---|---|---|
| b3log | siyuan | * | <3.5.10 |
References 1
- github.com https://github.com/siyuan-note/siyuan/security/advisories/GHSA-f9cq-v43p-v523
Remediation
No remediation data recorded yet
Check vendor advisories and the NVD entry for patch availability.