What is the CVSS score of CVE-2026-26279?

CVE-2026-26279 has a CVSS 3.1 base score of 9.1 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H. EPSS exploitation probability: 0.6%.

Which versions of Froxlor are affected by CVE-2026-26279?

Froxlor server administration software contains a critical vulnerability that disables email validation across all email-type fields, allowing attackers to inject malicious or invalid email addresses…. A patch is available.

Is there a public PoC exploit available for CVE-2026-26279?

Yes, a public proof-of-concept exploit is available for CVE-2026-26279. Prioritise patching immediately. EPSS: 0.6%.

How to fix or mitigate CVE-2026-26279?

Within 24 hours: Identify all systems running Froxlor versions prior to 2.3.4 and assess email-dependent workflows for unauthorized changes. Within 7 days: Apply the vendor patch to all affected Froxlor installations and verify email validation is functioning correctly in test environments. Within 30 days: Conduct a comprehensive audit of email configuration fields modified during the vulnerability window to identify and remediate any malicious entries.

Froxlor CVE-2026-26279

CRITICAL

OS Command Injection (CWE-78)

2026-03-03 security-advisories@github.com

GHSA-33mp-8p67-xj7c

RCE Froxlor

9.1

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

9.1 CRITICAL

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

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 22:05 vuln.today

PoC Detected

Mar 05, 2026 - 21:19 vuln.today

Public exploit code

Patch released

Mar 05, 2026 - 21:19 nvd

Patch available

CVE Published

Mar 03, 2026 - 23:15 nvd

CRITICAL 9.1

DescriptionGitHub Advisory

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.