CVE-2025-21609— SiYuan has an arbitrary file deletion vulnerability
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开源的一个隐私至上的个人知识管理系统。 SiYuan 3.1.18版本存在安全漏洞，该漏洞源于存在任意文件删除漏洞，攻击者利用此漏洞可以导致服务器上的任意文件被删除。
Possible ATT&CK Techniques 1 AI
T1485 · Data Destruction
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I. Basic Information for CVE-2025-21609
Vulnerability Information
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Vulnerability Title
SiYuan has an arbitrary file deletion vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
SiYuan is self-hosted, open source personal knowledge management software. SiYuan Note version 3.1.18 has an arbitrary file deletion vulnerability. The vulnerability exists in the `POST /api/history/getDocHistoryContent` endpoint. An attacker can craft a payload to exploit this vulnerability, resulting in the deletion of arbitrary files on the server. Commit d9887aeec1b27073bec66299a9a4181dc42969f3 fixes this vulnerability and is expected to be available in version 3.1.19.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
清理环节不完整
Source: CVE Program / CVE List V5
Vulnerability Title
SiYuan 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
SiYuan是SiYuan开源的一个隐私至上的个人知识管理系统。 SiYuan 3.1.18版本存在安全漏洞，该漏洞源于存在任意文件删除漏洞，攻击者利用此漏洞可以导致服务器上的任意文件被删除。
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 | = 3.1.18 | - |
|
II. Public POCs for CVE-2025-21609
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2025-21609 (1)
Vendor Advisories for CVE-2025-21609 (1)
-
Arbitrary file deletion vulnerability · Advisory · siyuan-note/siyuan · GitHub x_refsource_CONFIRM
IV. Related Vulnerabilities
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CVE-2026-109310
SiYuan v3.1.12 before v3.8.6 Denial of Service via getDynami -
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SiYuan v3.7.0 before v3.8.6 Arbitrary File Read via Plugin R -
CVE-2026-105205
SiYuan before 3.8.5 Information Disclosure via /api/block/ge -
CVE-2026-104410
SiYuan before 3.8.5 Information Disclosure via /api/export/p -
CVE-2026-103763
SiYuan before v3.8.5 Information Disclosure via /api/noteboo
Same vendor: siyuan-note
-
CVE-2026-109310
SiYuan v3.1.12 before v3.8.6 Denial of Service via getDynami -
CVE-2026-109309
SiYuan v3.7.0 before v3.8.6 Arbitrary File Read via Plugin R -
CVE-2026-105205
SiYuan before 3.8.5 Information Disclosure via /api/block/ge -
CVE-2026-104410
SiYuan before 3.8.5 Information Disclosure via /api/export/p -
CVE-2026-103762
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Same weakness: CWE-459
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V. Comments for CVE-2025-21609
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