Vulnerability · Published Jun 4, 2026 · Assigned by GitHub_M

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

High 8.6

In plain English

A high-severity incorrect authorization in froxlor from froxlor. 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.

Severity (CVSS 4.0)8.6High

Exploit odds (30 days)0.2%top 86.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Packagist	froxlor/froxlor	2.3.7	GHSA-gcv3-5v9q-fmhh

Affected products (as reported)

Vendor	Product	Versions
froxlor	froxlor	= 2.3.6

Weakness: CWE-863 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P

References

https://github.com/froxlor/froxlor/security/advisories/GHSA-gcv3-5v9q-fmhh x_refsource_CONFIRM
https://github.com/froxlor/froxlor/releases/tag/2.3.7 x_refsource_MISC