CVE-2026-41228 Froxlor has Local File Inclusion via path traversal in API `def_language` parameter that leads to Remote Code Execution
Authenticated users can exploit path traversal in the language parameter to achieve remote code execution on the server.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-41228?
CVE-2026-41228 is a critical path traversal vulnerability in froxlor, published on 23 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Froxlor is open source server administration software. Prior to version 2.3.6, the Froxlor API endpoint `Customers.update` (and `Admins.update`) does not validate the `def_language` parameter against the list of available language files. An authenticated customer can set `def_language` to a path traversal payload (e.g., `../../../../../var/customers/webs/customer1/evil`), which is stored in the database. On subsequent requests, `Language::loadLanguage()` constructs a file path using this value and executes it via `require`, achieving arbitrary PHP code execution as the web server user. Version 2.3.6 fixes the issue.
Weakness: CWE-98
Which versions are affected by CVE-2026-41228?
2 open source packages ship an affected version, including froxlor/froxlor. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
froxlor/froxlor Packagist | All versions | 2.3.6 |
froxlor/froxlor Packagist | All versions | 2.3.6 |
Products include Froxlor Froxlor.
How do I fix CVE-2026-41228?
Upgrade froxlor/froxlor to 2.3.6 or later.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-41228 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-41228 exists.
Other vulnerabilities in froxlor
- CVE-2023-6069 Improper Link Resolution Before File Access in froxlor/froxlor
- CVE-2023-0671 Code Injection in froxlor/froxlor
- CVE-2023-3173 Improper Restriction of Excessive Authentication Attempts in froxlor/froxlor
- CVE-2023-1307 Authentication Bypass by Primary Weakness in froxlor/froxlor
- CVE-2021-42325 Froxlor SQL injection vulnerability
Sources
Also known as GHSA-w59f-67xm-rxx7.