Vulnerability · Published Mar 3, 2026 · Assigned by GitHub_M

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

Critical 9.1

In plain English

A critical-severity OS command injection in Froxlor from froxlor. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 61% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)9.1Critical

Exploit odds (30 days)0.9%top 39.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Packagist	froxlor/froxlor	2.3.4	GHSA-33mp-8p67-xj7c

Affected products (as reported)

Vendor	Product	Versions
froxlor	Froxlor	< 2.3.4

Weakness: CWE-78, CWE-482 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

References

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