CVE-2026-74903
SiYuan before v3.7.4 Insufficient Access Control via spinBlockDOM
- State
- Published
- Severity
- 5.3 Medium
- Published
- Aug 18, 2026
- Updated
- Aug 18, 2026
- Reserved
- Aug 17, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 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 | VulnCheck |
| 3.1 | 4.3 Medium | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N | VulnCheck |
Weaknesses
- CWE-400 Uncontrolled Resource Consumption
Affected Products
| Product | Versions |
|---|---|
siyuansiyuan-note |
|
References
- GitHub Security Advisory (GHSA-3j8q-5c8c-grwm)vendor-advisory
- VulnCheck Advisory: SiYuan before v3.7.4 Insufficient Access Control via spinBlockDOMthird-party-advisory
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