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SiYuan EUVDEUVD-2026-57810

| CVE-2026-73606 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
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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. …

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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
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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.
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EUVD-2026-57810 vulnerability details – vuln.today
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