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Vulnerability record · CVE-2026-34839 · published 21 April 2026

CVE-2026-34839: Nicolargo glances information exposure vulnerability

Nicolargo · Glances

Glances is an open-source system cross-platform monitoring tool. Prior to version 4.5.4, the Glances web server exposes a REST API (`/api/4/*`) that is accessible without authentication and allows cross-origin requests from any origin due to a permissive CORS policy (`Access-Control-Allow-Origin: *`). This allows a malicious website to read sensitive system information from a running Glances instance in the victim’s browser, leading to cross-origin data exfiltration. While a previous advisory exists for XML-RPC CORS issues, this report demonstrates that the REST API (`/api/4/*`) is also affected and exposes significantly more sensitive data. Version 4.5.4 patches the issue.

7.7 CVSS 4.0 High EPSS 0.47% · top 61.8% CWE-200 · Information exposureCWE-306 · Missing authentication for critical function
7.7CVSS 4.0 base score
0.47%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

Glances is an open-source system cross-platform monitoring tool. Prior to version 4.5.4, the Glances web server exposes a REST API (`/api/4/*`) that is accessible without authentication and allows cross-origin requests from any origin due to a permissive CORS policy (`Access-Control-Allow-Origin: *`). This allows a malicious website to read sensitive system information from a running Glances instance in the victim’s browser, leading to cross-origin data exfiltration. While a previous advisory exists for XML-RPC CORS issues, this report demonstrates that the REST API (`/api/4/*`) is also affected and exposes significantly more sensitive data. Version 4.5.4 patches the issue.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/nicolargo/glances/commit/fdfb977b1d91b5e410bc06c4e19f8bedb0005ce9 Patch
https://github.com/nicolargo/glances/security/advisories/GHSA-gfc2-9qmw-w7vh ExploitVendor Advisory
https://github.com/nicolargo/glances/security/advisories/GHSA-gfc2-9qmw-w7vh ExploitVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.1CVE-2026-32611Nicolargo glances sql injection vulnerabilityGlances is an open-source system cross-platform monitoring tool. The GHSA-x46r fix (commit 39161f0) addressed SQL injection in the TimescaleDB export…EPSS 0.40%9.1CVE-2026-32633Nicolargo glances information exposure vulnerabilityGlances is an open-source system cross-platform monitoring tool. Prior to version 4.5.2, in Central Browser mode, the `/api/4/serverslist` endpoint r…EPSS 0.61%8.7CVE-2026-32596Nicolargo glances information exposure vulnerabilityGlances is an open-source system cross-platform monitoring tool. Prior to 4.5.2, Glances web server runs without authentication by default when start…EPSS 1.7%8.7CVE-2026-30928Nicolargo glances information exposure vulnerabilityGlances is an open-source system cross-platform monitoring tool. Prior to 4.5.1, the /api/4/config REST API endpoint returns the entire parsed Glance…EPSS 1.6%8.1CVE-2026-32634Nicolargo glances origin validation error vulnerabilityGlances is an open-source system cross-platform monitoring tool. Prior to version 4.5.2, in Central Browser mode, Glances stores both the Zeroconf-ad…EPSS 0.23%8.1CVE-2026-32610Nicolargo glances vulnerabilityGlances is an open-source system cross-platform monitoring tool. Prior to version 4.5.2, the Glances REST API web server ships with a default CORS co…EPSS 0.49%7.8CVE-2026-33641Nicolargo glances os command injection vulnerabilityGlances is an open-source system cross-platform monitoring tool. Prior to version 4.5.3, Glances supports dynamic configuration values in which subst…EPSS 0.78%7.5CVE-2026-32609Nicolargo glances information exposure vulnerabilityGlances is an open-source system cross-platform monitoring tool. The GHSA-gh4x fix (commit 5d3de60) addressed unauthenticated configuration secrets e…EPSS 0.59%

Source: NIST National Vulnerability Database (record CVE-2026-34839), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.