https://cve.radiocsirt.org/rss/recent/all/10 Most recent entries from all 2026-10-16T03:07:42.200843+00:00 Vulnerability-Lookup csirt@opendfir.org python-feedgen Contains only the most 10 recent entries. https://cve.radiocsirt.org/vuln/euvd-2026-275214 EUVD-2026-275214 2026-10-16T03:07:42.245924+00:00 EUVD-2026-275214 https://cve.radiocsirt.org/vuln/fkie_cve-2026-30926 fkie_cve-2026-30926 2026-10-16T03:07:42.245961+00:00

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.

 https://cve.radiocsirt.org/vuln/ghsa-f9cq-v43p-v523 GHSA-f9cq-v43p-v523 — SiYuan: Authorization Bypass Allows Low-Privilege Publish User to Modify Notebook Content via /api/block/appendHeadingC… 2026-10-16T03:07:42.245994+00:00

Affected: Go: github.com/siyuan-note/siyuan/kernel

### Summary A privilege escalation vulnerability exists in the publish service of SiYuan Note that allows a low-privilege publish account (RoleReader) to modify notebook content via the `/api/block/appendHeadingChildren` API endpoint.

The endpoint only requires `model.CheckAuth`, which accepts `RoleReader` sessions. Because the endpoint performs a persistent document mutation and does not enforce `CheckAdminRole` or `CheckReadonly`, a publish user with read-only privileges can append new blocks to existing documents.

This allows remote authenticated publish users to modify notebook content and compromise the integrity of stored notes.

### Details

File: router.go, block.go, block.go, session.go Lines: router.go:245, api/block.go:193-205, model/block.go:688-714, model/session.go:201-209 Vulnerable Code: ``` - router.go: ginServer.Handle("POST", "/api/block/appendHeadingChildren", model.CheckAuth, appendHeadingChildren) - api/block.go: model.AppendHeadingChildren(id, childrenDOM) - model/block.go: indexWriteTreeUpsertQueue(tree) (persists document mutation) - session.go: CheckAuth accepts RoleReader as authenticated ``` Why Vulnerable: A low-privilege publish account (RoleReader, read-only) passes CheckAuth, but this write endpoint lacks CheckAdminRole and CheckReadonly. The handler performs persistent document writes.

### PoC

1. Enable publish service and create low-privilege account ``` curl -u workspace:<ACCESS_AUTH_CODE> \ -H "Content-Type: application/json" \ -d '{…