CVE-2026-74904

High

Description

SiYuan before v3.7.4 is missing authorization checks in 17 block metadata/content endpoints in kernel/api/block.go (including getRefText, checkBlockExist, and getBlockBreadcrumb). These handlers are gated only by basic authentication (model.CheckAuth) and lack publish-access filtering, allowing anonymous publish-mode readers to disclose private block content-derived text, structural metadata, and existence information for arbitrary block IDs across the workspace.

SeverityHigh

CVSS7.5

Exploit probability—

ProductGithub.com/siyuan-note/siyuan/kernel

PublishedAug 18, 2026

First seenAug 18, 2026

Weakness typeCWE-862Missing authorization

How to fix

Update

github.com/siyuan-note/siyuan/kernel0.0.0-20260804015139-bd067a4fe9b2 or later

Vendor advisories

github.com/siyuan-note/siyuan/security/advisories/GHSA-4vpg-gwqq-w44c

Affected products

Product	Affected versions	Fixed in
github.com/siyuan-note/siyuan/kernelGo	v < 0.0.0-20260804015139-bd067a4fe9b2	0.0.0-20260804015139-bd067a4fe9b2

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