High severity8.9NVD Advisory· Published Aug 30, 2026

CVE-2026-82654

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.

Affected products

Siyuan Note/Siyuanllm-fuzzy
Range: <3.8.1

Patches

Vulnerability mechanics

References

github.com/siyuan-note/siyuan/security/advisories/GHSA-hf87-qh3j-3p88nvd
www.vulncheck.com/advisories/siyuan-before-3.8.1-stored-xss-via-block-namenvd

News mentions

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cvss	0.579
epss	0.000
exploit	0.000
kev	0.000
patch	-0.070
ransomware	0.000