What is CVE-2026-44423?

CVE-2026-44423 is a medium-severity vulnerability in Shellhub, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 6.5/10. Published 2026-05-13.

How severe is CVE-2026-44423?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Auth bypass in Shellhub

CVE-2026-44423

ShellHub is a centralized SSH gateway. Prior to 0.24.2, GET /api/sessions/:uid returns the full session object for any authenticated caller, without scoping by the caller's tenant. An authenticated user can read session records (SSH username, device UID, remote IP, terminal type, authenticated flag, timestamps) belonging to any other namespace. This vulnerability is fixed in 0.24.2.

Vulnerability class: IDOR (Insecure Direct Object Reference)

Published 2026-05-13 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.004 (27.2th percentile), scored 2026-10-19.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 27th percentile — 27.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.004 · change: +0.001

Affected products

Shellhub
Shellhub-Io Shellhub — versions < 0.24.2

Weakness classification (CWE)

CWE-639 — Authorization Bypass Through User-Controlled Key

References

github.com/shellhub-io/shellhub/security/advisories/GHSA-9w9c-9w8m-w89q (Exploit, Vendor Advisory)

Frequently asked questions

What is CVE-2026-44423?: CVE-2026-44423 is a medium-severity vulnerability in Shellhub, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 6.5/10. Published 2026-05-13.
How severe is CVE-2026-44423?: Medium severity. CVSS v3 base score is 6.5 out of 10.