Is CVE-2026-40077 actively exploited?

No active exploitation of CVE-2026-40077 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-40077 be exploited remotely?

Yes. CVE-2026-40077 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-40077?

CVE-2026-40077 has a CVSS score of 3.5 (LOW).

HOME VULNERABILITIESCVE-2026-40077

LOW

CVE-2026-40077

CWE-184Published: April 9, 2026· Updated: Apr 13, 2026

3.5

CVSS v3.1

EPSS:0.05%probability of exploitation in 30 daysPercentile:14.9th

Official Description

Beszel is a server monitoring platform. Prior to 0.18.7, some API endpoints in the Beszel hub accept a user-supplied system ID and proceed without further checks that the user should have access to that system. As a result, any authenticated user can access these routes for any system if they know the system's ID. System IDs are random 15 character alphanumeric strings, and are not exposed to all users. However, it is theoretically possible for an authenticated user to enumerate a valid system ID via web API. To use the containers endpoints, the user would also need to enumerate a container ID, which is 12 digit hexadecimal string. This vulnerability is fixed in 0.18.7.

NVD Source

Technical Analysis

CVE-2026-40077 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.