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SiYuan CVE-2026-74903

| EUVDEUVD-2026-60584 MEDIUM
Uncontrolled Resource Consumption (CWE-400)
2026-08-18 VulnCheck GHSA-rm42-2qwv-9xcq
Denial Of Service Siyuan
5.3
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
5.3 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/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
5.4 MEDIUM

Network-reachable API requires authenticated low-privilege session; availability impact (A:L) added to reflect endpoint starvation described, correcting the VA:N omission in the provided vector.

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

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/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
Low
User Interaction
None
Scope
X

Lifecycle Timeline

2
Patch available
Aug 18, 2026 - 12:02 EUVD
Analysis Generated
Aug 18, 2026 - 11:46 vuln.today

DescriptionCVE.org

SiYuan before v3.7.4 contains an insufficient access control vulnerability in the /api/lute/spinBlockDOM endpoint, which is guarded only by CheckAuth middleware instead of CheckAdminRole like its sibling endpoint. Authenticated users with RoleEditor or RoleReader roles can invoke the endpoint to transform arbitrary DOM input, and large payloads cause endpoint starvation through per-path mutex serialization.

AnalysisAI

Insufficient access control on the /api/lute/spinBlockDOM endpoint in SiYuan before v3.7.4 allows any authenticated low-privilege user (RoleEditor or RoleReader) to invoke a DOM-transformation API that should be admin-only, and to trigger endpoint starvation by submitting large payloads that monopolize the per-path mutex. The CVSS 4.0 base score is 5.3 (Medium), reported by VulnCheck with a fix available in v3.7.4. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Obtain RoleEditor or RoleReader credentials
Delivery
Authenticate to SiYuan instance
Exploit
Submit oversized DOM payload to /api/lute/spinBlockDOM
Execution
Hold per-path mutex through large processing job
Impact
Starve endpoint, denying service to other users
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Vulnerability AssessmentAI

Exploitation Exploitation requires a valid authenticated session for the SiYuan instance - specifically, an account holding the RoleEditor or RoleReader role (not just admin). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N) confirms network exploitation with low complexity and low privileges, consistent with the description. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An authenticated SiYuan user - for example, a workspace collaborator granted RoleReader access - submits a series of crafted HTTP POST requests with oversized DOM payloads to /api/lute/spinBlockDOM. Each large request acquires the per-path mutex and holds it for the duration of processing, queuing subsequent requests and starving the endpoint for all users. …
Remediation Upgrade SiYuan to v3.7.4 or later, which is the vendor-released patch for this vulnerability per the advisory at https://github.com/siyuan-note/siyuan/security/advisories/GHSA-3j8q-5c8c-grwm. … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-74903 vulnerability details – vuln.today
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