CVE-2026-26279

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

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

froxlor · Froxlor

CVSS v3.1 GITHUB

9.1 CRITICALCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

EPSS

1.15% chance of exploitation in the next 30 days, 66th percentile

Published

2026-03-03

Updated

2026-03-04

Proof-of-concept exploits (1)

• advisories/GHSA-33mp-8p67-xj7c

Security advisories

• froxlor/Froxlor/security/advisories/GHSA-33mp-8p67-xj7c
• froxlor/froxlor/commit/22249677107f8f39f8d4a238605641e87dab4343

References

• CVE Record
• NVD entry