CVE-2026-34839

HIGH EPSS 32.6%
Published Apr 21, 20262mo ago · Modified Jun 17, 20261w ago
7.7 CVSS 4.0
High
Find Similar
Published Apr 21, 2026 2mo ago
Last Modified Jun 17, 2026 1w ago

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 Details

Base Score
7.7
Exploitability
—
Impact
—
Vector string
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:X/V:X/RE:X/U:X
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
32.6% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 3

CWE-200 Exposure of Sensitive Information to an Unauthorized Actor Information Exposure
CWE-306 Missing Authentication for Critical Function Authentication
CWE-942

Affected Products 1

VendorProductVersionRange
nicolargoglances* <4.5.4

References 2

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

Remediation

  • github.com https://github.com/nicolargo/glances/commit/fdfb977b1d91b5e410bc06c4e19f8bedb0005ce9
    Patch