Froxlor has an authorization bypass in FTP shell assignment via missing server-side `available_shells` enforcement
CVE-2026-41235

8.6HIGH

Key Information:

Vendor

Froxlor

Status
Froxlor
Vendor
CVE Published:
4 June 2026

What is CVE-2026-41235?

Froxlor is open source server administration software. Version 2.3.6 lets administrators configure system.available_shells as the approved shell list that customers may assign to FTP users. However, the server-side FTP account handlers do not enforce that whitelist when processing add or edit requests. As a result, an authenticated customer with shell delegation enabled can submit an arbitrary shell such as /bin/bash even when the panel UI only offers more restricted choices. In deployments that use the default nssextrausers integration, the attacker-controlled shell is then propagated into the system account database, leading to real host shell access. Version 2.3.7 fixes the issue.

Affected Version(s)

froxlor = 2.3.6

References

https://github.com/froxlor/froxlor/security/advisories/GH...
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https://github.com/froxlor/froxlor/releases/tag/2.3.7
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CVSS V4

Score:
8.6
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.