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CVE-2026-72812— SiYuan before v3.7.4 Missing Authorization via refreshBacklink

Quick assessment

Affected
siyuan-note siyuan
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

SiYuan是SiYuan团队开源的一款文档管理软件。 SiYuan 3.7.4之前版本存在授权问题漏洞，该漏洞源于/api/ref/refreshBacklink端点缺少授权验证，可能导致匿名读者触发服务器端持久写入，通过攻击者控制的块ID刷新事务队列并全局扫描引用，绕过只读保护，进而导致资源放大攻击。

CVSS 6.5 · Medium EPSS 0.38% · P30

Affected Version Matrix 2

VendorProduct Version RangeStatus
siyuan-note siyuan < 3.7.4 affected
3.7.4 unaffected
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I. Basic Information for CVE-2026-72812

Vulnerability Information
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Vulnerability Title
SiYuan before v3.7.4 Missing Authorization via refreshBacklink
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
SiYuan 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
SiYuan是SiYuan团队开源的一款文档管理软件。 SiYuan 3.7.4之前版本存在授权问题漏洞，该漏洞源于/api/ref/refreshBacklink端点缺少授权验证，可能导致匿名读者触发服务器端持久写入，通过攻击者控制的块ID刷新事务队列并全局扫描引用，绕过只读保护，进而导致资源放大攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
siyuan-note siyuan 0 ~ 3.7.4 -

II. Public POCs for CVE-2026-72812

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III. Intelligence Information for CVE-2026-72812

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Vendor Advisories for CVE-2026-72812 (2)

Same Patch Batch · siyuan-note · 2026-08-14 · 6 CVEs total

CVE-2026-72811 10.0 CRITICAL SiYuan before v3.7.4 SQL Injection via backlink search
CVE-2026-72810 8.6 HIGH SiYuan before v3.7.4 Publish-Boundary Bypass via WebSocket
CVE-2026-73630 5.8 MEDIUM SiYuan before v3.7.4 Information Disclosure via authFilePublishAccess
CVE-2026-73049 5.8 MEDIUM SiYuan before v3.7.4 Information Disclosure via getAttributeViewBacklinks
CVE-2026-73048 5.8 MEDIUM SiYuan before v3.7.4 Information Disclosure via getRefIDsByFileAnnotationID

IV. Related Vulnerabilities

Same product: siyuan
Same vendor: siyuan-note
Same weakness: CWE-862

V. Comments for CVE-2026-72812

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