by Kastro
Paper/Archive/CVE-2026-74800

CVE-2026-74800

siyuan-note siyuan — SiYuan before v3.7.4 Stored XSS via assets endpoint

EPSS 0.4%CVSS 9.4
critical.is priorityof 100
36
CVSS 9.4 (CNA)9.4 / 10 × 3028.2Not in CISA KEV+300.0EPSS percentile 37.1.371 × 207.4No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

SiYuan before v3.7.4 fails to set Content-Disposition and X-Content-Type-Options headers when serving arbitrary file assets, allowing stored cross-site scripting attacks. Authenticated attackers can upload HTML files as assets and execute scripts with full kernel API access when the workspace owner opens the asset link.

Affected

ProductAffectedFixed inSource
siyuan< 3.7.43.7.4CNA

Scores by source

VulnCheck (CNA)9.4CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
VulnCheck (CNA)9.0CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

advisorygithub.com/siyuan-note/siyuan/security/advisories/GHSA-mjf3-jwmf-r6wfwriteupvulncheck.com/advisories/siyuan-before-stored-xss-via-assets-endpoint