CVE-2026-26279Public exploitNetwork attack vector

Admin-to-root command execution via unvalidated admin email

Published Mar 3, 2026 · Updated Mar 3, 2026

OS command injection in Froxlor before 2.3.4 allows remote authenticated users with administrator access to execute commands as root. validateFormFieldEmail discards a comparison instead of setting string_type to mail, so panel.adminmail accepts pipe-containing input that AcmeSh.php concatenates into safe_exec. Exploitation requires panel administrator access, Let's Encrypt enabled, acme.sh absent at its configured path, and the root cron task to run.

CVSS severity9.1
Critical
EPSS probability0.80%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in Froxlor before 2.3.4 allows remote authenticated users with administrator access to execute commands as root. validateFormFieldEmail discards a comparison instead of setting string_type to mail, so panel.adminmail accepts pipe-containing input that AcmeSh.php concatenates into safe_exec. Exploitation requires panel administrator access, Let's Encrypt enabled, acme.sh absent at its configured path, and the root cron task to run.

The record

CVE
CVE-2026-26279
Published
Mar 3, 2026
Updated
Mar 3, 2026
Vendor
Froxlor
Product
Froxlor
Classifications
CWE-78, CWE-482, T1059.004, T1068
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Mar 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 3, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2.3.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Froxlor · Froxlorversion=< 2.3.4

Published CVSS scores

9.1GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CWE-482Comparing instead of Assigning
T1059.004Unix Shell
T1068Exploitation for Privilege Escalation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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