CVE-2026-74904CWE-862broken-access-control

CVE-2026-74904

High · published August 18, 2026

CVSS v3.1
7.5
EPSS
1%
Percentile
42.2
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS v4.0
8.7 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
EPSS
0.00504 · 42.2th percentile
Weakness
CWE-862 · Missing Authorization
Published
2026-08-18T16:19Z
References (3)
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-4vpg-gwqq-w44c · [email protected]https://www.vulncheck.com/advisories/siyuan-before-missing-authorization-via-block-api · [email protected]https://github.com/siyuan-note/siyuan/security/advisories/GHSA-4vpg-gwqq-w44c · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 18 AUG 11:19Z
    SiYuan before v3.7.4 Missing Authorization via block API
    cvelistv5