CVE-2026-26279 Froxlor Admin-to-Root Privilege Escalation via Input Validation Bypass + OS Command Injection
An authenticated admin can achieve root-level remote code execution by bypassing email validation to inject commands into a cron job.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-26279?
CVE-2026-26279 is a critical command injection vulnerability in Froxlor, published on 3 Mar 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-26279?
2 open source packages ship an affected version, including froxlor/froxlor. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
froxlor/froxlor Packagist | All versions | 2.3.4 |
froxlor/froxlor Packagist | All versions | 2.3.4 |
Products include Froxlor Froxlor.
How do I fix CVE-2026-26279?
Upgrade froxlor/froxlor to 2.3.4 or later.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-26279 being exploited?
There is no known exploitation of CVE-2026-26279 in the wild and no public exploit code.
Other vulnerabilities in Froxlor
- CVE-2026-41228 Froxlor has Local File Inclusion via path traversal in API `def_language` parameter that leads to Remote Code Execution
- CVE-2023-6069 Improper Link Resolution Before File Access in froxlor/froxlor
- CVE-2023-0671 Code Injection in froxlor/froxlor
- CVE-2023-3173 Improper Restriction of Excessive Authentication Attempts in froxlor/froxlor
- CVE-2023-1307 Authentication Bypass by Primary Weakness in froxlor/froxlor
Sources
Also known as GHSA-33mp-8p67-xj7c.