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CVE-2026-82654— SiYuan before v3.8.1 Stored XSS via block name

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团队开源的一个以隐私为先的个人知识管理系统。 SiYuan 3.8.1之前版本存在跨站脚本漏洞，该漏洞源于未正确转义提示、反向链接和面包屑渲染功能中的块名称、别名和备注字段，可能导致攻击者设置包含HTML/script标签的块名称，当其他用户查看引用或显示该块的文档时执行恶意脚本。

CVSS 8.9 · High EPSS 0.37% · P29

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 2

VendorProduct Version RangeStatus
siyuan-note siyuan < 3.8.1 affected
3.8.1 unaffected
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I. Basic Information for CVE-2026-82654

Vulnerability Information
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Vulnerability Title
SiYuan before v3.8.1 Stored XSS via block name
Source: CVE Program / CVE List V5
Vulnerability Description
SiYuan before v3.8.1 fails to properly escape block name, alias, and memo fields in hint, backlink, and breadcrumb rendering functions. Attackers can set a block's name to contain HTML/script tags that execute when another user views documents referencing or displaying that block.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
SiYuan 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
SiYuan是SiYuan团队开源的一个以隐私为先的个人知识管理系统。 SiYuan 3.8.1之前版本存在跨站脚本漏洞，该漏洞源于未正确转义提示、反向链接和面包屑渲染功能中的块名称、别名和备注字段，可能导致攻击者设置包含HTML/script标签的块名称，当其他用户查看引用或显示该块的文档时执行恶意脚本。
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 ~ 3.8.1 -

II. Public POCs for CVE-2026-82654

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III. Intelligence Information for CVE-2026-82654

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Vendor Advisories for CVE-2026-82654 (2)

Same Patch Batch · siyuan-note · 2026-08-30 · 6 CVEs total

CVE-2026-82653 8.9 HIGH SiYuan before v3.8.1 Stored XSS via confirmDialog
CVE-2026-82649 7.0 HIGH SiYuan before 3.8.1 Local Privilege Escalation via Uncontrolled Search Path
CVE-2026-82652 5.3 MEDIUM SiYuan before v3.8.1 Information Disclosure via Publish Access
CVE-2026-82651 4.9 MEDIUM SiYuan before v3.8.1 Missing Authorization via /history and /repo/diff
CVE-2026-82650 4.4 MEDIUM SiYuan before v3.8.1 Path Traversal via /api/template/render

IV. Related Vulnerabilities

Same product: siyuan
Same vendor: siyuan-note
Same weakness: CWE-79

V. Comments for CVE-2026-82654

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