CVE-2026-74903
SiYuan before v3.7.4 Insufficient Access Control via spinBlockDOM
CVSS Score
4.3
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-400 |
| Vendor | siyuan-note |
| Product | siyuan |
| Published | Aug 18, 2026 |
| Last Updated | Aug 18, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None
Affected Versions
siyuan-note / siyuan
0 < 3.7.4
References
Credits
🔍 KushSathwara