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TI-2026-28908 Aliases CVE-2026-40077GHSA-5f5r-95pg-xrpm

Beszel has an IDOR in hub API endpoints that read system ID from URL parameter

Priority MEDIUM 50CWE-184Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
High
Impact type
—
Confidentiality · integrity · availability
Low · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00228 13th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed beszel (henrygd): 0.18.7github.com/henrygd/beszel (Go): 0.18.7

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
henrygdbeszelbefore 0.18.70.18.7Patch availableCNA
—github.com/henrygd/beszel (Go)before 0.18.70.18.7Patch availableGHSA-5f5r-95pg-xrpm
  • beszel Vendorhenrygd Affected before 0.18.7 Fixed in 0.18.7 Patch available CNA
  • github.com/henrygd/beszel (Go) Vendor— Affected before 0.18.7 Fixed in 0.18.7 Patch available GHSA-5f5r-95pg-xrpm

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:beszel:beszel:*:*:*:*:*:*:*:*before 0.18.7VulnerableBeszel
  • cpe:2.3:a:beszel:beszel:*:*:*:*:*:*:*:* Versions before 0.18.7 Vulnerable ·Beszel

Remediation

  • Fix · CNA beszel (henrygd) Fixed in 0.18.7
  • Fix · GHSA-5f5r-95pg-xrpm github.com/henrygd/beszel (Go) Fixed in 0.18.7 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-40077
  2. 2026-10-03 Alias added: GHSA-5f5r-95pg-xrpm

References

Exploit 1

Advisory 1

Other 2

  • TI-2026-63405 Beszel before 0.19.0 Insecure Direct Object Reference via user-alerts CVSS 4.0LOW 2.3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences