critical9.0
CVE-2026-74800
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 scripti…
Impact
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 products
| Product | Affected versions |
|---|---|
| SiYuan | before 3.7.4 |
Versions were read from the advisory text. No structured product data has been published for this record yet.