CVE-2026-82654
Critical · CVSS 9.3Published 2026-08-30
CVSS
9.3
Critical
EPSS
—
exploit probability
Active Exploit
No
not yet listed
High — patch soon — High severity. Target patch within 7 days.
What is CVE-2026-82654?
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 Score Explained
CVSS 9.3 is Critical — the highest severity tier. Attackers can likely exploit this remotely with no authentication and cause full system compromise. Patch immediately.
EPSS Exploitation Probability
No EPSS score yet — model needs more data on this CVE.
References & Patches
- ›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
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