CVE-2026-74800
SiYuan before v3.7.4 Stored XSS via assets endpoint
- State
- Published
- Severity
- 9.4 Critical
- Published
- Aug 17, 2026
- Updated
- Aug 17, 2026
- Reserved
- Aug 16, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 9.4 Critical | CVSS: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 |
| 3.1 | 9.0 Critical | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H | VulnCheck |
Weaknesses
- CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Products
| Product | Versions |
|---|---|
siyuansiyuan-note |
|
References
- GitHub Security Advisory (GHSA-mjf3-jwmf-r6wf)vendor-advisory
- VulnCheck Advisory: SiYuan before v3.7.4 Stored XSS via assets endpointthird-party-advisory
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