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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 在 v3.8.1 之前的版本未能正确转义提示、反向链接和面包屑导航渲染功能中的块名称、别名和备注字段。攻击者可以将某个块的名称设置为包含 HTML 或脚本标签，当其他用户查看引用或显示该块的文档时，这些标签将会被执行。

CVSS 8.9 · High Updated Aug 30, 2026

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

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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

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
siyuan-note	siyuan	0 ~ 3.8.1	-

II. Public POCs for CVE-2026-82654

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-82654

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Vendor Advisories for CVE-2026-82654 (1)

🔗 Stored HTML/script injection via block name in hint, backlink, and breadcrumb rendering (regression of a prior fix, plus two unpatched sibling instances) · Advisory · siyuan-note/siyuan · GitHub Read full article vendor-advisory

Other References for CVE-2026-82654 (1)

SiYuan before v3.8.1 Stored XSS via block name | Advisories | VulnCheck third-party-advisory

https://www.cve.org/CVERecord?id=CVE-2026-82654

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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Goal Reached Thanks to every supporter — we hit 100%!

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

Quick assessment

Possible ATT&CK Techniques 1 AI

I. Basic Information for CVE-2026-82654

Vulnerability Information

Vulnerability Title

Vulnerability Description

CVSS Information

Vulnerability Type

Affected Products

II. Public POCs for CVE-2026-82654

III. Intelligence Information for CVE-2026-82654

Vendor Advisories for CVE-2026-82654 (1)

Other References for CVE-2026-82654 (1)

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

IV. Related Vulnerabilities

V. Comments for CVE-2026-82654

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