LIVE · cybersecurity feed
Live wire
OpenAI Announced $1B in Defensive Tools for Water UtilitiesAttackers Breached JetBrains Cadence via Unpatched TeamCity, Extracting AWS CredentialsCVE-2026-59346 · Critical VMware Workstation and Fusion Flaw Lets VM Admins Execute Host CodeCVE-2026-32475 · Elementor Pro WordPress Plugin Vulnerability Exploited to Hack SitesBroadcom Patches Critical VMware Workstation and Fusion VM-Escape VulnerabilitiesHackers Leak Millions of Airport Passenger Records After Ransom RefusalUsing a VM to Contain an AI AgentCVE-2026-73749 · HPE Patches Critical RCE Vulnerabilities in AOS-CXCompanies Have Six Months to Prepare for Automated AttacksPhishing Campaign Sends Millions of Emails Using Invisible Unicode to Evade Filters
cve recordcritical

CVE-2026-84803

Published
CVSS9
Severitycritical
WeaknessCWE-79
ExploitedNot in CISA KEV

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

Description

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.

References

← Back to the CVE Tracker

Our coverage of CVE-2026-84803

No stories yet. This page updates automatically when we publish reporting that references CVE-2026-84803.