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.

CVSS Vector

References

• https://github.com/siyuan-note/siyuan/security/advisories/GHSA-hf87-qh3j-3p88
• https://www.vulncheck.com/advisories/siyuan-before-3.8.1-stored-xss-via-block-name