CVE-2026-72812
SiYuan before v3.7.4 Missing Authorization via refreshBacklink
- State
- Published
- Severity
- 6.9 Medium
- Published
- Aug 14, 2026
- Updated
- Aug 17, 2026
- Reserved
- Aug 10, 2026
Description
SiYuan versions before v3.7.4 contain a missing authorization vulnerability in the /api/ref/refreshBacklink endpoint that allows anonymous readers to trigger persistent server-side writes. Attackers can invoke the endpoint with an attacker-controlled block ID to flush transaction queues, scan all references globally, and enqueue database writes, bypassing read-only protections and enabling resource amplification attacks.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.9 Medium | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 6.5 Medium | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L | VulnCheck |
Weaknesses
- CWE-862 Missing Authorization
Affected Products
| Product | Versions |
|---|---|
siyuansiyuan-note |
|
References
- GitHub Security Advisory (GHSA-wgwx-479j-23vq)vendor-advisory
- VulnCheck Advisory: SiYuan before v3.7.4 Missing Authorization via refreshBacklinkthird-party-advisory
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