Vulnerability · Published Apr 9, 2026 · Assigned by GitHub_M
CVE-2026-40077Beszel has an IDOR in hub API endpoints that read system ID from URL parameter
Low 3.5
In plain English
A low-severity security flaw in beszel from henrygd. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 14% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/henrygd/beszel | 0.18.7 | GHSA-5f5r-95pg-xrpm |
| Go | github.com/henrygd/beszel | 0.18.7 | GO-2026-5141 |
Affected products (as reported)
Weakness: CWE-184 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N
References
- https://github.com/henrygd/beszel/security/advisories/GHSA-5f5r-95pg-xrpm x_refsource_CONFIRM
- https://github.com/henrygd/beszel/releases/tag/v0.18.7 x_refsource_MISC