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SiYuan EUVDEUVD-2026-57809

| CVE-2026-73605 MEDIUM
Missing Authorization (CWE-862)
2026-08-13 VulnCheck GHSA-xxm9-w59q-m66x
Path Traversal 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 endpoint with no authentication (PR:N); impact is solely low confidentiality disclosure of filesystem path existence, 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 a path traversal vulnerability in the getUniqueFilename endpoint that allows anonymous readers to probe filesystem existence without validation or confinement. Attackers can supply arbitrary absolute paths to determine whether files and directories exist on the host, enabling reconnaissance of the filesystem layout and installed software.

AnalysisAI

Unauthenticated filesystem reconnaissance in SiYuan versions before v3.7.4 allows any network-reachable anonymous reader to probe arbitrary absolute paths on the host via the getUniqueFilename endpoint, which performs no authorization check or path confinement before returning existence results. The missing authorization control (CWE-862) means the attack requires zero credentials and zero user interaction against any exposed SiYuan HTTP interface, enabling structured enumeration of filesystem layout, installed software, and sensitive path locations as a precursor to more targeted attacks. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Locate network-exposed SiYuan HTTP interface
Delivery
Send unauthenticated GET/POST to getUniqueFilename endpoint
Exploit
Supply arbitrary absolute filesystem path as parameter
Execution
Observe existence indicator in response
Persist
Iterate paths to map host filesystem
Impact
Leverage reconnaissance for targeted follow-on exploitation
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Vulnerability AssessmentAI

Exploitation Exploitation requires only network-level HTTP access to a SiYuan instance running any version prior to v3.7.4 - no account, no session token, and no special configuration is required, as the vulnerability is reachable by anonymous readers. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 score of 6.9 Medium appropriately reflects a vulnerability that is trivially reachable but limited in direct damage. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An unauthenticated attacker identifies a SiYuan instance exposed on the network and sends a series of crafted HTTP requests to the `getUniqueFilename` endpoint, each supplying a different absolute filesystem path such as `/etc/shadow`, `/root/.ssh/authorized_keys`, `/home/user/.aws/credentials`, or Windows equivalents. The endpoint returns responses that reveal whether each queried path exists, allowing the attacker to methodically map the host's filesystem structure, discover installed software, locate sensitive configuration files, and build a targeting profile for a subsequent, more damaging attack against the same system. …
Remediation Upgrade SiYuan to v3.7.4 or later, which resolves the missing authorization check in the `getUniqueFilename` endpoint; the vendor advisory at https://github.com/siyuan-note/siyuan/security/advisories/GHSA-hf8h-97gm-4x2p should be consulted for release details. … Detailed patch versions, workarounds, and compensating controls in full report.
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EUVD-2026-57809 vulnerability details – vuln.today
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