CVE-2026-82654

High

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.

SeverityHigh

CVSS8.9

Exploit probability31. percentile0.4%

ProductSiyuan

PublishedAug 30, 2026

First seenAug 30, 2026

Weakness typeCWE-79Cross-site scripting (XSS)

How to fix

Update

siyuan-note siyuan3.8.1 or later

Vendor advisories

github.com/siyuan-note/siyuan/security/advisories/GHSA-hf87-qh3j-3p88

Affected products

Product	Affected versions	Fixed in
siyuan-note siyuan	v < 3.8.1	3.8.1

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