CVE-2026-72812
SiYuan before v3.7.4 Missing Authorization via refreshBacklink
CVSS Score
6.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-862 |
| Vendor | siyuan-note |
| Product | siyuan |
| Published | Aug 14, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
Low
Affected Versions
siyuan-note / siyuan
0 < 3.7.4
References
Credits
🔍 Shirshakhtml