8.7

CVE-2026-74904: siyuan-note siyuan Missing Authorization

CVSS: 8.7v4.0HighDeferred
AliasesGHSA-4vpg-gwqq-w44cGO-2026-6654
Published 18-08-2026Last modified 18-08-2026
Open JSON

Vulnerability summary

CVE-2026-74904 is a high (CVSS 8.7) Missing Authorization vulnerability in siyuan-note siyuan. EPSS estimates a 0.50% chance of exploitation in the next 30 days, higher than 41.8% of scored vulnerabilities.

Overall risk
35/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.7/10
010
High · v4.0 (CVE.org)
EPSS score
0.50%
0%100%
Low · +0.15 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 18-08-2026
    PublishedVulnerability first disclosed.
  2. 18-08-2026
    Last modifiedVulnerability information updated.

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 metrics

5 scores · 3 sources · 2 versions

EPSS trend

Probability

0.50%

Chance of exploitation in the next 30 days

Percentile

42%

Versus all other CVEs

30-day change

+0.15 pp

From 0.36% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.50%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Github.com/siyuan-note/siyuan1 product
  • kernel< 0.0.0-20260804015139-bd067a4fe9b2
Siyuan-note1 product

2 vendors · 2 products

References

6 links