Five critical vulnerabilities attackers are using against self-hosted servers right now. Plain English, no jargon — and a free 30-second check for each one.
Last updated: October 15, 2026. Sources: CISA KEV catalog, NVD, vendor advisories.
CRITICAL · CVSS 10.0
CVE-2026-21962 — Oracle WebLogic Proxy Plug-in
What it is: A flaw in the WebLogic Server proxy plug-in that lets attackers run their own code on the server — the worst kind of vulnerability, and it is on CISA's exploited-in-the-wild list.
What it is: Add-ons configured with host network mode expose unauthenticated endpoints to your local network — any device on the same Wi-Fi can reach them without logging in.
Fix: Update Supervisor to 2026.03.2; review which add-ons use host network mode and whether they need to.
What it is: Command injection in proxy.php of Nextcloud's built-in Collabora CODE Server app. Attackers planted PHP web shells with web-server permissions in September and October 2026 — and disabling the app does not fix it.
Fix: Update richdocumentscode to 26.4.303 or newer, or remove the app entirely.
What it is: Authenticated remote code execution — any Langflow user, even low-privilege, can add a malicious MCP server and get full command execution on the host.
Fix: Upgrade to 1.10.3 or newer (1.9.0 minimum); audit every configured MCP server for commands you did not authorize.
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Honest scope: this map tracks the self-host CVEs getting real-world exploitation attention. It is a triage aid, not a pentest — patch everything, and verify with a real scan.
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