Vulnerability · Published May 13, 2026 · Assigned by GitHub_M

CVE-2026-44426ShellHub: Cross-tenant IDOR in `GET /api/namespaces/:tenant` via API Key bypasses membership check

Medium 6.5

In plain English

A medium-severity authorization bypass via user-controlled key in shellhub from shellhub-io. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 24% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.3%top 76.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

ShellHub is a centralized SSH gateway. Prior to 0.24.2, GET /api/namespaces/:tenant returns the full namespace object — including the members list (user IDs, e-mails, roles), settings, and device counts — to any caller authenticated by an API Key, for any tenant, regardless of the API Key's own tenant scope. The handler conditionally skips the membership check when the user ID (X-ID) is absent, which is exactly the case for API Key authentication. This vulnerability is fixed in 0.24.2.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Go	github.com/shellhub-io/shellhub	0.24.2	GHSA-vwx9-7qcf-gg7f
Go	github.com/shellhub-io/shellhub	0.24.2	GO-2026-5680

Affected products (as reported)

Vendor	Product	Versions
shellhub-io	shellhub	< 0.24.2

Weakness: CWE-639 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

References

https://github.com/shellhub-io/shellhub/security/advisories/GHSA-vwx9-7qcf-gg7f x_refsource_CONFIRM