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CVE-2026-26279

Froxlor remote code execution

9.1 CRITICALPublic exploitEPSS 1.15%
  1. Published3 Mar 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredHigh
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Affected products

Froxlor< 2.3.4

Remediation

Fixed in
Froxlor≥ 2.3.4

References

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Frequently asked

Is CVE-2026-26279 being actively exploited?

CVE-2026-26279 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 1.15%.

How severe is CVE-2026-26279?

CVE-2026-26279 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 1.15% probability of exploitation.

Which products are affected by CVE-2026-26279?

Affected products include Froxlor.

How do I fix CVE-2026-26279?

Upgrade affected software to a fixed version, for example Froxlor 2.3.4 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-26279 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.