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Vulnerability record · CVE-2026-74904 · published 18 August 2026

CVE-2026-74904: Missing authorization vulnerability

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.

8.7 CVSS 4.0 High EPSS 0.50% · top 59.4% CWE-862 · Missing authorization Deferred
8.7CVSS 4.0 base score
0.50%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
26 Aug 2026Last modified by NVD

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.

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-4vpg-gwqq-w44c
https://www.vulncheck.com/advisories/siyuan-before-missing-authorization-via-block-api
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-4vpg-gwqq-w44c

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Source: NIST National Vulnerability Database (record CVE-2026-74904), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.