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CVE-2026-126266— SiYuan from 3.6.0 before 3.8.9 Publish-Password Bypass via getDoc Regex Keywords

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 3.6.0 至 3.8.9（不含）版本存在一个信息泄露漏洞，允许未认证的发布访问者通过 接口中的正则表达式搜索功能绕过文档级密码保护。攻击者可以向 发送 POST 请求，将 参数设置为 3，并使用宽泛的正则表达式，从而读取返回结果中未经过滤的 字段里包含的受保护正文内容。

CVSS 7.5 · High EPSS 0.38% · P32

Affected Version Matrix 2

VendorProduct Version RangeStatus
siyuan-note siyuan 3.6.0< 3.8.9 affected
3.8.9 unaffected
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I. Basic Information for CVE-2026-126266

Vulnerability Information
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Vulnerability Title
SiYuan from 3.6.0 before 3.8.9 Publish-Password Bypass via getDoc Regex Keywords
Source: CVE Program / CVE List V5
Vulnerability Description
SiYuan from 3.6.0 before 3.8.9 contains an information disclosure vulnerability that allows unauthenticated publish visitors to bypass per-document passwords via regex search in getDoc. Attackers can send POST requests to /api/filetree/getDoc with queryMethod 3 and a broad regex to read protected body text returned in the unfiltered keywords field.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
siyuan-note siyuan 3.6.0 ~ 3.8.9 -

II. Public POCs for CVE-2026-126266

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III. Intelligence Information for CVE-2026-126266

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Vendor Advisories for CVE-2026-126266 (2)

Same Patch Batch · siyuan-note · 2026-11-13 · 4 CVEs total

CVE-2026-126264 7.7 HIGH SiYuan before 3.8.9 Sensitive File Disclosure via /api/file/getFile
CVE-2026-126265 7.4 HIGH SiYuan 2.1.0 before 3.8.9 CAPTCHA Bypass via Stale Login Cookie
CVE-2026-126393 6.1 MEDIUM SiYuan before 3.8.10 SSRF via Skill-Install Download Redirect and DNS Rebinding

IV. Related Vulnerabilities

Same product: siyuan
Same vendor: siyuan-note
Same weakness: CWE-200