7.1

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2026-30926

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

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.

(GitHub Advisory)

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CVE-2026-30926

CVE-2026-30926:

7.1

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
github.com/siyuan-note/siyuan/kernel	go	<= 0.0.0-20260304035530-d03ebdec8279

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability lies in the /api/block/appendHeadingChildren endpoint, which allows a low-privilege user to modify notebook content. The root cause is an improper access control check in router.go. The route uses model.CheckAuth, which only verifies that the user is authenticated, but does not check if the user has write permissions. This allows a user with read-only privileges (RoleReader) to call the appendHeadingChildren function in api/block.go. This function, in turn, calls model.AppendHeadingChildren in model/block.go, which performs the actual modification of the notebook content. The fix would be to replace model.CheckAuth with a more restrictive middleware that checks for admin or write privileges, such as CheckAdminRole.

Vulnerable functions

appendHeadingChildren

api/block.go

This function handles the request to append content to a heading. It is vulnerable because the route that directs to it does not enforce sufficient privileges, allowing a read-only user to perform a write operation.

model.AppendHeadingChildren

model/block.go

This function is called by the vulnerable `appendHeadingChildren` handler and is responsible for the underlying logic of appending the heading children. It ultimately leads to a persistent write to the database via `indexWriteTreeUpsertQueue`.

model.CheckAuth

model/session.go

This function is used as a middleware for authentication. The vulnerability exists because this check is too permissive for a write operation, as it allows users with `RoleReader` to proceed. The fix would involve replacing this with a more restrictive check like `CheckAdminRole`.

Vulnerability Intelligence
Miggo AI

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WAF Protection Rules

WAF Rule

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Reasoning

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