by Kastro
Paper/Archive/CVE-2026-82654

CVE-2026-82654

siyuan-note siyuan — SiYuan before v3.8.1 Stored XSS via block name

EPSS 0.4%CVSS 9.3
critical.is priorityof 100
34
CVSS 9.3 (CNA)9.3 / 10 × 3027.9Not in CISA KEV+300.0EPSS percentile 30.5.305 × 206.1No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
siyuan< 3.8.13.8.1CNA

Scores by source

VulnCheck (CNA)9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L
VulnCheck (CNA)8.9CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:L
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

advisorygithub.com/siyuan-note/siyuan/security/advisories/GHSA-hf87-qh3j-3p88writeupvulncheck.com/advisories/siyuan-before-3.8.1-stored-xss-via-block-name