Skip to main content

SiYuan CVE-2026-73606

| EUVDEUVD-2026-57810 MEDIUM
Authorization Bypass Through User-Controlled Key (CWE-639)
2026-08-13 VulnCheck GHSA-gq43-vcrh-6jw8
Information Disclosure Authentication Bypass Siyuan
6.9
CVSS 4.0 · Vendor: VulnCheck
Share

Severity by source

Vendor (VulnCheck) PRIMARY
6.9 MEDIUM
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/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:X/V:X/RE:X/U:X
vuln.today AI
5.3 MEDIUM

Network-reachable API endpoint requires no credentials; impact limited to metadata disclosure with no integrity or availability consequence.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

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/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:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

2
Patch available
Aug 13, 2026 - 13:01 EUVD
Analysis Generated
Aug 13, 2026 - 12:56 vuln.today

DescriptionCVE.org

SiYuan versions before v3.7.4 contain an information disclosure vulnerability in the /api/block/getRefIDs endpoint that fails to check password-protected document tiers. Unauthenticated readers can discover that password-protected documents reference specific blocks and obtain block identifiers without entering the document password.

AnalysisAI

Unauthenticated access to the /api/block/getRefIDs endpoint in SiYuan before v3.7.4 exposes block reference metadata from password-protected documents, allowing remote attackers without any credentials to enumerate internal document structures. The endpoint fails to enforce the document-level password tier before returning block identifiers, meaning the password protection on sensitive documents is effectively bypassed for this API route. …

Unlock full vulnerability intelligence

  • Risk assessment & exploitation conditions
  • Attack chain visualization
  • Remediation with exact patch versions
  • Threat intelligence from 22 sources
  • Personal watchlist & email alerts
Continue with Google Continue with GitHub

Free forever · No credit card required

Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Identify internet-facing SiYuan API port
Delivery
Send HTTP request to /api/block/getRefIDs with target block IDs
Exploit
Endpoint skips password-tier authorization check
Execution
Server returns block reference identifiers from protected documents
Impact
Attacker enumerates protected document structure
Sign in to reveal

Vulnerability AssessmentAI

Exploitation The target SiYuan instance must be running a version prior to v3.7.4 and its API port must be network-reachable by the attacker. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 base score of 6.9 reflects a network-accessible (AV:N), low-complexity (AC:L), unauthenticated (PR:N) vulnerability with limited confidentiality impact on both the vulnerable system (VC:L) and subsequent system (SC:L). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An unauthenticated remote attacker sends an HTTP request to the /api/block/getRefIDs endpoint of an internet-facing SiYuan instance, supplying one or more block IDs obtained through any means such as guessing or prior enumeration. The server responds with block reference identifiers from password-protected documents without verifying whether the requester has the document password, revealing which blocks are referenced within sensitive documents. …
Remediation The primary remediation is to upgrade SiYuan to v3.7.4 or later, which corrects the missing authorization check in the /api/block/getRefIDs endpoint. … Detailed patch versions, workarounds, and compensating controls in full report.
Sign in to read full assessment

Threat intelligence, references, and detailed analysis are available after sign-in.

More in Siyuan

View all
CVE-2026-69084 CRITICAL POC
9.9 Aug 03

SQL injection in SiYuan personal knowledge management (versions <= v3.7.2) lets attackers pass arbitrary SQL statements

CVE-2024-53507 CRITICAL POC
9.8 Nov 29

A SQL injection vulnerability was discovered in Siyuan 3.1.11 in /getHistoryItems. Rated critical severity (CVSS 9.8), t
CVE-2024-53506 CRITICAL POC
9.8 Nov 29

A SQL injection vulnerability has been identified in Siyuan 3.1.11 via the ids array parameter in /batchGetBlockAttrs. R
CVE-2024-53505 CRITICAL POC
9.8 Nov 29

A SQL injection vulnerability has been identified in Siyuan 3.1.11 via the id parameter at /getAssetContent. Rated criti
CVE-2024-53504 CRITICAL POC
9.8 Nov 29

A SQL injection vulnerability has been identified in Siyuan 3.1.11 via the notebook parameter in /searchHistory. Rated c
CVE-2026-23852 CRITICAL POC
9.6 Jan 19

SiYuan personal knowledge management system prior to 3.5.4 has a stored XSS vulnerability (CVSS 9.6) that allows code ex
CVE-2026-54069 CRITICAL POC
9.2 Jun 24

Origin-validation bypass in SiYuan Note (open-source personal knowledge management) before 3.7.0 lets any installed Chro
CVE-2026-29183 CRITICAL POC
9.3 Mar 06

Reflected XSS in SiYuan knowledge management before 3.5.9.
CVE-2026-25539 CRITICAL POC
9.1 Feb 04

SiYuan knowledge management system prior to 3.5.5 has a path traversal in /api/file/copyFile allowing arbitrary file ope
CVE-2024-2692 CRITICAL POC
9.0 Apr 04

SiYuan version 3.0.3 allows executing arbitrary commands on the server. Rated critical severity (CVSS 9.0), this vulnera
CVE-2026-29073 HIGH POC
8.8 Mar 06

SQL injection in SiYuan prior to version 3.6.0 allows any authenticated user, including those with read-only access, to

CVE-2026-34605 HIGH POC
8.6 Mar 31

Cross-site scripting (XSS) in SiYuan personal knowledge management system versions 3.6.0-3.6.1 allows remote attackers t

Same weakness CWE-639 – Authorization Bypass Through User-Controlled Key

View all
CVE-2024-50483 CRITICAL
9.8
CVE-2026-55255 HIGH POC
8.4
CVE-2025-3605 CRITICAL POC
9.8
CVE-2022-3805 HIGH POC
8.6
CVE-2025-5947 CRITICAL POC
9.8
CVE-2020-36923 CRITICAL POC
9.8
CVE-2025-14998 CRITICAL POC
9.8
CVE-2023-3048 CRITICAL POC
9.8

Same technique Information Disclosure

View all
CVE-2019-2725 CRITICAL POC
9.8
CVE-2021-34523 CRITICAL POC
9.0
CVE-2013-2251 CRITICAL POC
9.8
CVE-2017-5638 CRITICAL POC
9.8
CVE-2025-24813 CRITICAL POC
9.8
CVE-2015-1701 HIGH POC
7.8
CVE-2017-0147 HIGH POC
7.5
CVE-2014-6324 HIGH POC
8.8

Share

CVE-2026-73606 vulnerability details – vuln.today
Back

This site uses cookies essential for authentication and security. No tracking or analytics cookies are used. Privacy Policy