CVE-2026-26279
Received Received - Intake
Input Validation Bypass in Froxlor Enables Root Remote Code Execution

Publication date: 2026-03-03

Last updated on: 2026-03-05

Assigner: GitHub, Inc.

Description
Froxlor is open source server administration software. Prior to 2.3.4, a typo in Froxlor's input validation code (== instead of =) completely disables email format checking for all settings fields declared as email type. This allows an authenticated admin to store arbitrary strings in the panel.adminmail setting. This value is later concatenated into a shell command executed as root by a cron job, where the pipe character | is explicitly whitelisted. The result is full root-level Remote Code Execution. This vulnerability is fixed in 2.3.4.
CVSS Scores
EPSS Scores
Probability:
Percentile:
Meta Information
Published
2026-03-03
Last Modified
2026-03-05
Generated
2026-06-16
AI Q&A
2026-03-04
EPSS Evaluated
2026-06-15
NVD
CVE-2026-26279
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
froxlor froxlor to 2.3.4 (exc)
Helpful Resources
Exploitability
CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-78 The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.
CWE-482 The code uses an operator for comparison when the intention was to perform an assignment.
Attack-Flow Graph
AI Quick Actions
Instant insights powered by AI
Executive Summary

This vulnerability exists in Froxlor, an open source server administration software, in versions prior to 2.3.4. Due to a typo in the input validation code (using '==' instead of '='), the software completely disables email format checking for fields declared as email type. This allows an authenticated admin user to store arbitrary strings in the panel.adminmail setting.

Later, this stored value is concatenated into a shell command executed as root by a cron job. Since the pipe character '|' is explicitly whitelisted, an attacker can exploit this to execute arbitrary commands with root privileges, resulting in full root-level Remote Code Execution (RCE).

This vulnerability was fixed in Froxlor version 2.3.4.

Impact Analysis

This vulnerability can have severe impacts because it allows an authenticated administrator to execute arbitrary commands with root privileges on the server running Froxlor.

An attacker exploiting this flaw can gain full control over the affected system, potentially leading to data theft, data loss, service disruption, installation of malware, or further attacks within the network.

Since the attack requires authenticated admin access, the risk is higher if admin credentials are compromised or if there are multiple administrators with access.

Compliance Impact

I don't know

Detection Guidance

I don't know

Mitigation Strategies

The vulnerability is fixed in Froxlor version 2.3.4. Immediate mitigation involves upgrading Froxlor to version 2.3.4 or later.

Since the vulnerability allows an authenticated admin to inject arbitrary strings into the panel.adminmail setting, restricting admin access and reviewing this setting for suspicious values can help reduce risk until the upgrade is applied.

Chat Assistant
Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-26279. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70
EPSS Chart