What’s Vulnerable › Vulnerabilities

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

• Severity: critical (CVSS 9.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-03-03 · updated 2026-06-17
• Weakness: CWE-78

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.

Affected products

• froxlor: before 2.3.4 — fixed in 2.3.4

How to fix

Upgrade to a fixed version: froxlor 2.3.4. Check the vendor advisory for mitigations.

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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