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THREAT OPS › Threat News › [NVD] CVE-2026-82654 (HIGH 8.9) — 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

[NVD] CVE-2026-82654 (HIGH 8.9) — 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

mednvdPublished 2026-08-30

CVE-2026-82654 CVSS: 8.9 HIGH Published: 2026-08-30T15:16:46.173

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.

Indicators of compromise

CVE-2026-82654cve

Original source: https://nvd.nist.gov/vuln/detail/CVE-2026-82654