Is CVE-2026-34839 actively exploited?

No active exploitation of CVE-2026-34839 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-34839 be exploited remotely?

Yes. CVE-2026-34839 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-34839?

CVE-2026-34839 has a CVSS score of 6.5 (MEDIUM).

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MEDIUM

CVE-2026-34839

CWE-200Published: April 21, 2026· Updated: Apr 24, 2026

6.5

CVSS v3.1

EPSS:0.06%probability of exploitation in 30 daysPercentile:17.7th

Official 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.

NVD Source

Technical Analysis

CVE-2026-34839 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 6.5.

From a weakness classification perspective (CWE-200): Information exposure vulnerabilities leak sensitive data to unauthorized actors.