How severe is CVE-2026-41228?

CVE-2026-41228 has a CVSS 3.x base score of 9.9, rated critical severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-41228 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (41st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-41228?

CVE-2026-41228 affects Froxlor. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-41228?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-41228 have an EU (EUVD) identifier?

Yes. CVE-2026-41228 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-25176.

When was CVE-2026-41228 published?

CVE-2026-41228 was published on 2026-04-23 and last updated on 2026-06-17.

CVE-2026-41228

CVE-2026-41228 is a critical-severity vulnerability in Froxlor with a CVSS 3.x base score of 9.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-98.

Key facts

Severity: Critical (CVSS 3.x base score 9.9)
EPSS exploit prediction: 1% (41st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-25176
Weakness: CWE-98
Affected product: Froxlor
Published: 2026-04-23
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-41228?: 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.
How severe is CVE-2026-41228?: CVE-2026-41228 has a CVSS 3.x base score of 9.9, rated critical severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-41228 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (41st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-41228?: CVE-2026-41228 affects Froxlor. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-41228?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-41228 have an EU (EUVD) identifier?: Yes. CVE-2026-41228 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-25176.
When was CVE-2026-41228 published?: CVE-2026-41228 was published on 2026-04-23 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:froxlor:froxlor:*:*:*:*:*:*:*:*

More vulnerabilities in Froxlor

CVE-2023-6069 — Critical (CVSS 9.9): Improper Link Resolution Before File Access in GitHub repository froxlor/froxlor prior to 2.1.0.
CVE-2023-3173 — Critical (CVSS 9.8): Improper Restriction of Excessive Authentication Attempts in GitHub repository froxlor/froxlor prior to 2.0.20.
CVE-2023-1307 — Critical (CVSS 9.8): Authentication Bypass by Primary Weakness in GitHub repository froxlor/froxlor prior to 2.0.13.
CVE-2021-42325 — Critical (CVSS 9.8): Froxlor through 0.10.29.1 allows SQL injection in Database/Manager/DbManagerMySQL.php via a custom DB name.
CVE-2015-5959 — Critical (CVSS 9.8): Froxlor before 0.9.33.2 with the default configuration/setup might allow remote attackers to obtain the database…
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