Vulnerability · Published May 13, 2026 · Assigned by GitHub_M

CVE-2026-44423ShellHub: Cross-tenant IDOR in `GET /api/sessions/:uid` discloses SSH session data

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 0.2% (higher than 16% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.2%top 84.1% 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/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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Go	github.com/shellhub-io/shellhub	0.24.2	GHSA-9w9c-9w8m-w89q
Go	github.com/shellhub-io/shellhub	0.24.2	GO-2026-5302

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-9w9c-9w8m-w89q x_refsource_CONFIRM