Bug 2454404 (CVE-2026-33533)

Summary: CVE-2026-33533 Glances: Glances: Information disclosure via improper Cross-Origin Resource Sharing (CORS) configuration
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Glances, an open-source system monitoring tool. The Glances XML-RPC server, when activated, sends a wildcard Access-Control-Allow-Origin header and does not validate the Content-Type header. This allows a remote attacker to craft a malicious webpage that can issue a Cross-Origin Resource Sharing (CORS) "simple request" to the server. This vulnerability enables the complete exfiltration of sensitive system monitoring data, including hostname, operating system (OS) version, IP addresses, CPU, memory, disk, and network statistics, as well as the full process list, which may contain sensitive information like tokens or passwords.
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Description OSIDB Bzimport 2026-04-02 16:01:33 UTC 
Glances is an open-source system cross-platform monitoring tool. Prior to version 4.5.3, the Glances 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. The result is 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). This issue has been patched in version 4.5.3.