CVE-2026-26279

Froxlor Admin-to-Root Privilege Escalation via Input Validation Bypass + OS Command Injection

State: Published
Severity: 9.1 Critical
Published: Mar 3, 2026
Updated: Mar 4, 2026
Reserved: Feb 12, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	9.1 Critical	CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H	GitHub_M

Weaknesses

CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CWE-482 Comparing instead of Assigning

Affected Products

Product	Versions
Froxlorfroxlor	< 2.3.4Affected

References

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