{"id":"CVE-2026-82654","title":"SiYuan before v3.8.1 fails to properly escape block name, alias, and memo fields in hint, backlink, and breadcrumb rendering functions","summary":"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 doc…","severity":"high","cvss":8.9,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:L","cwe":["CWE-79"],"published":"2026-08-30","updated":"2026-08-30","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-82654","references":[{"url":"https://github.com/siyuan-note/siyuan/security/advisories/GHSA-hf87-qh3j-3p88","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/siyuan-before-3.8.1-stored-xss-via-block-name","label":"disclosure@vulncheck.com"}],"tags":["nvd"],"ingestedAt":"2026-08-30T23:59:28.820Z","epss":0.00223,"epssPercentile":0.13208,"slug":"CVE-2026-82654","body":"## Overview\n\nSiYuan 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":49,"depthScoreParts":{"impact":49,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}