critical9.0
CVE-2026-84803
SiYuan before v3.8.2 contains a stored cross-site scripting vulnerability in asset serving due to an incomplete extension blocklist that misses script-capable …
Impact
SiYuan before v3.8.2 contains a stored cross-site scripting vulnerability in asset serving due to an incomplete extension blocklist that misses script-capable file types. Attackers can upload files with extensions like .xht, .ehtml, .xsl, .xbl, or .rdf that resolve to executable media types and execute JavaScript to steal API tokens and compromise workspaces.
Affected products
| Product | Affected versions |
|---|---|
| SiYuan | before 3.8.2 |
Versions were read from the advisory text. No structured product data has been published for this record yet.