CVE-2026-41228

publishedCWE-98

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.

Technical severity9.9 criticalCVSS 3.1 · NVD: [email protected]

Published2026-04-23Source updated 2026-11-11

Collected2026-11-122 attributed sources

Fixes and workarounds

Fix

The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.

Source: [email protected]

Fix

froxlor/froxlor (Packagist): OSV reports a fixed version 2.3.6. Check the advisory for supported release branches.

Source: OSV GHSA-w59f-67xm-rxx7

Affected products and versions

Affected products, source version ranges and reporting authorities
Product	Versions	Authority
froxlor froxlor	< 2.3.6 (affected, custom)	NVD
froxlor/froxlor `froxlor/froxlor` Packagist	0.10.0 (affected, Packagist) 0.10.0-rc1 (affected, Packagist) 0.10.0-rc2 (affected, Packagist) 0.10.1 (affected, Packagist) 0.10.10 (affected, Packagist) 0.10.11 (affected, Packagist) 0.10.12 (affected, Packagist) 0.10.13 (affected, Packagist) 0.10.14 (affected, Packagist) 0.10.15 (affected, Packagist) 0.10.16 (affected, Packagist) 0.10.17 (affected, Packagist) 0.10.18 (affected, Packagist) 0.10.19 (affected, Packagist) 0.10.2 (affected, Packagist) 0.10.20 (affected, Packagist) 0.10.21 (affected, Packagist) 0.10.22 (affected, Packagist) 0.10.23 (affected, Packagist) 0.10.23.1 (affected, Packagist) 0.10.24 (affected, Packagist) 0.10.25 (affected, Packagist) 0.10.26 (affected, Packagist) 0.10.27 (affected, Packagist) 0.10.28 (affected, Packagist) 0.10.29 (affected, Packagist) 0.10.29.1 (affected, Packagist) 0.10.3 (affected, Packagist) 0.10.30 (affected, Packagist) 0.10.31 (affected, Packagist) 0.10.32 (affected, Packagist) 0.10.33 (affected, Packagist) 0.10.34 (affected, Packagist) 0.10.34.1 (affected, Packagist) 0.10.35 (affected, Packagist) 0.10.35.1 (affected, Packagist) 0.10.36 (affected, Packagist) 0.10.37 (affected, Packagist) 0.10.38 (affected, Packagist) 0.10.38.1 (affected, Packagist) 0.10.38.2 (affected, Packagist) 0.10.38.3 (affected, Packagist) 0.10.4 (affected, Packagist) 0.10.5 (affected, Packagist) 0.10.6 (affected, Packagist) 0.10.7 (affected, Packagist) 0.10.8 (affected, Packagist) 0.10.9 (affected, Packagist) 2.0.0 (affected, Packagist) 2.0.1 (affected, Packagist) 2.0.10 (affected, Packagist) 2.0.11 (affected, Packagist) 2.0.12 (affected, Packagist) 2.0.13 (affected, Packagist) 2.0.14 (affected, Packagist) 2.0.15 (affected, Packagist) 2.0.16 (affected, Packagist) 2.0.17 (affected, Packagist) 2.0.18 (affected, Packagist) 2.0.19 (affected, Packagist) 2.0.2 (affected, Packagist) 2.0.20 (affected, Packagist) 2.0.21 (affected, Packagist) 2.0.22 (affected, Packagist) 2.0.23 (affected, Packagist) 2.0.24 (affected, Packagist) 2.0.3 (affected, Packagist) 2.0.4 (affected, Packagist) 2.0.5 (affected, Packagist) 2.0.6 (affected, Packagist) 2.0.7 (affected, Packagist) 2.0.8 (affected, Packagist) 2.0.9 (affected, Packagist) 2.1.0 (affected, Packagist) 2.1.0-beta1 (affected, Packagist) 2.1.0-beta2 (affected, Packagist) 2.1.0-rc1 (affected, Packagist) 2.1.0-rc2 (affected, Packagist) 2.1.0-rc3 (affected, Packagist) 2.1.1 (affected, Packagist) 2.1.2 (affected, Packagist) 2.1.3 (affected, Packagist) 2.1.4 (affected, Packagist) 2.1.5 (affected, Packagist) 2.1.6 (affected, Packagist) 2.1.7 (affected, Packagist) 2.1.8 (affected, Packagist) 2.1.9 (affected, Packagist) 2.2.0 (affected, Packagist) 2.2.0-rc1 (affected, Packagist) 2.2.0-rc2 (affected, Packagist) 2.2.0-rc3 (affected, Packagist) 2.2.1 (affected, Packagist) 2.2.2 (affected, Packagist) 2.2.3 (affected, Packagist) 2.2.4 (affected, Packagist) 2.2.5 (affected, Packagist) 2.2.6 (affected, Packagist) 2.2.7 (affected, Packagist) 2.2.8 (affected, Packagist) 2.3.0 (affected, Packagist) 2.3.0-rc1 (affected, Packagist) 2.3.1 (affected, Packagist) 2.3.2 (affected, Packagist) 2.3.3 (affected, Packagist) 2.3.4 (affected, Packagist) 2.3.5 (affected, Packagist) Ecosystem version events: introduced 0; fixed 2.3.6 Source events (ECOSYSTEM) `[ { "introduced": "0" }, { "fixed": "2.3.6" } ]` Other versions: unaffected	OSV GHSA-w59f-67xm-rxx7

Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.

NVD applicability configurations (1)

These expressions retain AND/OR operators, negation, and required environmental products. A listed product is not sufficient to establish exposure when additional conditions apply.

[
  {
    "negate": false,
    "nodes": [
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:a:froxlor:froxlor:*:*:*:*:*:*:*:*",
            "versionEndExcluding": "2.3.6",
            "vulnerable": true
          }
        ],
        "negate": false,
        "operator": "OR"
      }
    ],
    "operator": "OR"
  }
]

CVSS assessments

CVSS scores, vectors and reporting authorities
Version / score	Vector	Authority
3.1 / 9.9 critical	`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H`	NVD: [email protected]

Exploit evidence

https://github.com/froxlor/froxlor/security/advisories/GHSA-w59f-67xm-rxx7
exploit · [email protected]
https://github.com/froxlor/froxlor/security/advisories/GHSA-w59f-67xm-rxx7
exploit · 134c704f-9b21-4f2e-91b3-4a467353bcc0

References

https://github.com/froxlor/froxlor/commit/bc5e6dbaa90e6f3573129da640595e8c770e1d0c[email protected] · Patch
https://github.com/froxlor/froxlor/releases/tag/2.3.6[email protected] · Release Notes
https://github.com/froxlor/froxlor/security/advisories/GHSA-w59f-67xm-rxx7[email protected] · Exploit, Mitigation, Vendor Advisory
https://github.com/froxlor/froxlor/security/advisories/GHSA-w59f-67xm-rxx7134c704f-9b21-4f2e-91b3-4a467353bcc0 · Exploit, Mitigation, Vendor Advisory
https://github.com/advisories/GHSA-w59f-67xm-rxx7OSV / GitHub Security Advisories · advisory
https://osv.dev/vulnerability/GHSA-w59f-67xm-rxx7OSV / GitHub Security Advisories · osv

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