Description
SiYuan versions before v3.7.4 fail to enforce publish-access checks in the getBlockAttrs and batchGetBlockAttrs endpoints. Attackers can retrieve block attributes including names, aliases, memos, and custom fields from protected documents by sending POST requests with block IDs.
Published: 2026-08-12
Score: 6.9 Medium
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Impact

SiYuan versions before 3.7.4 do not enforce publish‑access checks in the getBlockAttrs and batchGetBlockAttrs endpoints; attackers can send POST requests with block IDs to an exposed API and retrieve block attributes such as names, aliases, memos, and custom fields from protected documents. This flaw represents a missing authorization weakness (CWE-862) that can expose sensitive user data.

Affected Systems

Siyuan Note application, versions earlier than 3.7.4, deployed by any organization that hosts the service.

Risk and Exploitability

The CVSS score of 6.9 indicates moderate risk, and although the EPSS score is unavailable, the vulnerability can be exploited by sending crafted HTTP POST requests to the vulnerable API endpoints without authentication, making it potentially exploitable in environments where the API is reachable over the network. The vulnerability is not currently listed in CISA KEV.

Generated by OpenCVE AI on August 12, 2026 at 23:00 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Upgrade SiYuan to version 3.7.4 or later
  • Block unauthenticated access to the getBlockAttrs and batchGetBlockAttrs endpoints using a firewall or reverse‑proxy
  • Implement network segmentation so that only trusted internal services can reach the API surfaces.

Generated by OpenCVE AI on August 12, 2026 at 23:00 UTC.

Tracking

Sign in to view the affected projects.

Advisories

No advisories yet.

History

Wed, 12 Aug 2026 21:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Wed, 12 Aug 2026 19:30:00 +0000

Type Values Removed Values Added
Description SiYuan versions before v3.7.4 fail to enforce publish-access checks in the getBlockAttrs and batchGetBlockAttrs endpoints. Attackers can retrieve block attributes including names, aliases, memos, and custom fields from protected documents by sending POST requests with block IDs.
Title SiYuan before v3.7.4 Information Disclosure via getBlockAttrs
Weaknesses CWE-862
References
Metrics cvssV3_1

{'score': 5.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N'}

cvssV4_0

{'score': 6.9, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N'}

Subscriptions

No data.

cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-08-12T20:54:58.546Z

Reserved: 2026-08-10T15:11:49.794Z

Link: CVE-2026-72803

cve-icon Vulnrichment

Updated: 2026-08-12T20:42:06.472Z

cve-icon NVD

Status : Received

Published: 2026-08-12T20:17:52.247

Modified: 2026-08-12T21:17:40.190

Link: CVE-2026-72803

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-12T23:15:03Z

Weaknesses