CVE-2026-33533

Name of the Vulnerable Software and Affected Versions Glances versions prior to 4.5.3

Description Glances is a system cross-platform monitoring tool. The XML-RPC server (activated with glances -s or glances --server) sends Access-Control-Allow-Origin: * on every HTTP response. Because the XML-RPC handler does not validate the Content-Type header, an attacker-controlled webpage can issue a CORS "simple request" (POST with Content-Type: text/plain) containing a valid XML-RPC payload. The browser sends the request without a preflight check, the server processes the XML body and returns the full system monitoring dataset, and the wildcard CORS header lets the attacker's JavaScript read the response. This results in the complete exfiltration of hostname, OS version, IP addresses, CPU/memory/disk/network stats, and the full process list including command lines, which often contain tokens, passwords, or internal paths. The server's XML-RPC handler, located in glances/server.py, does not validate the Content-Type header, allowing the processing of XML payloads within a text/plain body. This is due to the inheritance from SimpleXMLRPCRequestHandler, which parses the POST body as XML regardless of the Content-Type. The lack of authentication in the default configuration (server.isAuth = False) further exacerbates the issue, making every XML-RPC server instance exploitable.

Recommendations Update Glances to version 4.5.3 or later.