CVE-2026-40077: Beszel is a server monitoring platform

Q: How do I fix CVE-2026-40077?

beszel: upgrade to 0.18.7. Exact commands for each OS are on this page.

Q: Is CVE-2026-40077 being exploited?

CVE-2026-40077 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-40077 affect?

CVE-2026-40077 affects beszel. Severity is low (CVSS 3.5). 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 authenticate

Q: How urgent is CVE-2026-40077?

Priority 20/100. Public exploit reference

Routine

LOW 3.5UPGRADE

CVE-2026-40077 is a low-severity flaw (CVSS 3.5) affecting beszel. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 a

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	3.5 (Low)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 88%)
CISA exploited list	No
Weakness	CWE-184
Published	2026-04-09
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: beszel

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-09 20:16 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

beszel beszel UPGRADE

Affected: < 0.18.7

Fixed in: 0.18.7

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy beszel || rpm -q beszel || beszel --version

2. UPGRADE to 0.18.7 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade beszel

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade beszel

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-40077?

beszel: upgrade to 0.18.7. Exact commands for each OS are on this page.

Is CVE-2026-40077 being exploited?

CVE-2026-40077 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-40077 affect?

CVE-2026-40077 affects beszel. Severity is low (CVSS 3.5). 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 authenticate

How urgent is CVE-2026-40077?

Priority 20/100. Public exploit reference

References

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