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SiYuan EUVDEUVD-2026-57814

| CVE-2026-73610 MEDIUM
Authorization Bypass Through User-Controlled Key (CWE-639)
2026-08-13 VulnCheck GHSA-8j5p-6pf5-6pqc
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-accessible unauthenticated endpoint with no scope change; confidentiality impact is low as only metadata is disclosed, not document content.

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:N/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 - 12:54 vuln.today

DescriptionCVE.org

SiYuan before v3.7.4 contains an information disclosure vulnerability in the local storage filter that returns the administrator's entire storage map with only three keys sanitized. Unauthenticated attackers or publish readers can retrieve closed-tab history, search keywords, private document identifiers, and expanded folder paths by calling the getLocalStorage endpoint.

AnalysisAI

The getLocalStorage API endpoint in SiYuan before v3.7.4 exposes the administrator's full local storage map to unauthenticated network callers and publish readers, with only three keys redacted by an incomplete sanitization filter. Sensitive operational metadata - including closed-tab history, search keywords, private document identifiers, and expanded folder paths - can be harvested in a single unauthenticated HTTP request against any network-accessible instance. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Identify network-exposed SiYuan instance
Delivery
Send unauthenticated HTTP request to getLocalStorage endpoint
Exploit
Receive full administrator storage map
Execution
Extract private document IDs and search history
Impact
Use metadata for targeted reconnaissance or follow-on access
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Vulnerability AssessmentAI

Exploitation The SiYuan HTTP API endpoint getLocalStorage must be reachable from the attacker's network location - instances bound solely to localhost or protected behind a VPN or authenticated reverse proxy are not directly exploitable. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 6.9 accurately captures the attack surface: the endpoint is network-reachable (AV:N), requires no special conditions (AC:L, AT:N), no privileges (PR:N), and no user interaction (UI:N), making it trivially automatable against any exposed instance. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An unauthenticated attacker who can reach the SiYuan HTTP API over the network sends a single HTTP GET request to the getLocalStorage endpoint without supplying any credentials. The server responds with the administrator's nearly complete local storage map, from which the attacker extracts private document identifiers and search keywords that reveal the types and topics of documents under management. …
Remediation Upgrade SiYuan to version 3.7.4 or later, which corrects the incomplete sanitization in the local storage filter. … Detailed patch versions, workarounds, and compensating controls in full report.
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EUVD-2026-57814 vulnerability details – vuln.today
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