Vulnerability · Published Apr 23, 2026 · Assigned by GitHub_M

CVE-2026-41228Froxlor has Local File Inclusion via path traversal in API `def_language` parameter that leads to Remote Code Execution

Critical 10.0

In plain English

A critical-severity security flaw in froxlor from froxlor. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 45% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)10.0Critical

Exploit odds (30 days)0.5%top 55.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Packagist	froxlor/froxlor	2.3.6	GHSA-w59f-67xm-rxx7

Affected products (as reported)

Vendor	Product	Versions
froxlor	froxlor	< 2.3.6

Weakness: CWE-98 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

References

https://github.com/froxlor/froxlor/security/advisories/GHSA-w59f-67xm-rxx7 x_refsource_CONFIRM
https://github.com/froxlor/froxlor/commit/bc5e6dbaa90e6f3573129da640595e8c770e1d0c x_refsource_MISC
https://github.com/froxlor/froxlor/releases/tag/2.3.6 x_refsource_MISC