CVE-2026-33533 Glances Vulnerable to Cross-Origin System Information Disclosure via XML-RPC Server CORS Wildcard
An attacker can exfiltrate sensitive system information, including process lists and credentials, via a malicious webpage due to insecure CORS configuration in the XML-RPC server.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-33533?
CVE-2026-33533 is a high-severity vulnerability in nicolargo glances, published on 2 Apr 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
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.
Weakness: CWE-942
Which versions are affected by CVE-2026-33533?
3 open source packages ship an affected version, including glances and Glances. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
glances PyPI | All versions | 4.5.3 |
glances PyPI | All versions | 4.5.3 |
Glances PyPI | All versions | 4.5.3 |
Products include Nicolargo Glances.
How do I fix CVE-2026-33533?
Upgrade glances to 4.5.3 or later.
Is CVE-2026-33533 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-33533 exists.
Other vulnerabilities in nicolargo glances
- CVE-2026-32633 Glances's Browser API Exposes Reusable Downstream Credentials via `/api/4/serverslist`
- CVE-2026-32596 Glances exposes the REST API without authentication
- CVE-2026-30928 Glances Exposes Unauthenticated Configuration Secrets
- CVE-2026-32610 Glances's Default CORS Configuration Allows Cross-Origin Credential Theft
- CVE-2026-32634 Glances Central Browser Autodiscovery Leaks Reusable Credentials to Zeroconf-Spoofed Servers
Sources
Also known as DEBIAN-CVE-2026-33533, GHSA-7p93-6934-f4q7, PYSEC-2026-2173, UBUNTU-CVE-2026-33533.