---
title: "CVE-2026-26279: Froxlor has Admin-to-Root Privilege Escalation via Input Validation Bypass + OS Command Injection"
url: https://erroneo.us/security/cve/CVE-2026-26279/
description: "CVE-2026-26279 (froxlor/froxlor (Composer (PHP))): Froxlor is open source server administration software. Prior to 2.3.4, a typo in Froxlor's input…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-03-03
date_modified: 2026-03-04
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-26279"
kev: false
cvss: 9.1
epss: 0.01172
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-26279: Froxlor has Admin-to-Root Privilege Escalation via Input Validation Bypass + OS Command Injection

**Signal:** Critical, preconditions apply. Severe if exploited, but exploitation needs conditions that may not apply to you. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 1.2% , percentile 67: FIRST’s model estimates a 1.2% chance of exploitation activity in the next 30 days, higher than 67% of all scored CVEs (moderate). EPSS is a probability, not a verdict.
- Needs an account (high (admin)). Exposure depends on who can log in.
- Only applies if your dependency tree includes froxlor/froxlor (Composer (PHP)) <= 2.3.3, fixed in 2.3.4 . Check your lockfile, including transitive dependencies.

## What it is

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.

## Affected packages

- Composer (PHP) `froxlor/froxlor` <= 2.3.3 → fixed: 2.3.4

## Affected products (CVE record)

- froxlor Froxlor: < 2.3.4

## Severity

- GitHub_M CVSS 3.1: 9.1 `CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H`
- GitHub CVSS 3.1: 9.1 `CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable no , technical impact total .
- FIRST EPSS (model of 2026-10-21): 1.17% probability of exploitation activity in the next 30 days; percentile 67.

## Sources

- [GitHub Advisory GHSA-33mp-8p67-xj7c](https://github.com/advisories/GHSA-33mp-8p67-xj7c)
- [CVE.org record CVE-2026-26279](https://www.cve.org/CVERecord?id=CVE-2026-26279)
- [NVD entry CVE-2026-26279](https://nvd.nist.gov/vuln/detail/CVE-2026-26279)
- [github.com](https://github.com/froxlor/Froxlor/security/advisories/GHSA-33mp-8p67-xj7c)
- [github.com](https://github.com/froxlor/froxlor/commit/22249677107f8f39f8d4a238605641e87dab4343)
- [github.com](https://github.com/froxlor/froxlor/releases/tag/2.3.4)

---
Source page: https://erroneo.us/security/cve/CVE-2026-26279/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt