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PatchSiren cyber security CVE debrief

CVE-2026-41235 froxlor CVE debrief

Froxlor server administration software version 2.3.6 has a vulnerability allowing authenticated customers with shell delegation enabled to submit an arbitrary shell, potentially leading to real host shell access. The issue is fixed in version 2.3.7.

Vendor
froxlor
Product
Unknown
CVSS
HIGH 8.6
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-04
Original CVE updated
2026-07-22
Advisory published
2026-06-04
Advisory updated
2026-07-22

Who should care

Administrators using Froxlor server administration software version 2.3.6, especially those with shell delegation enabled for customers.

Technical summary

In Froxlor server administration software version 2.3.6, administrators can configure `system.available_shells` as the approved shell list for FTP users. However, the server-side FTP account handlers do not enforce this whitelist when processing add or edit requests. This allows an authenticated customer with shell delegation enabled to submit an arbitrary shell, such as `/bin/bash`, even if the panel UI only offers more restricted choices. In deployments using the default `nssextrausers` integration, the attacker-controlled shell is then propagated into the system account database, leading to real host shell access.

Defensive priority

HIGH

Recommended defensive actions

  • Upgrade to Froxlor version 2.3.7 or later.
  • Review and restrict shell delegation for customers.
  • Monitor FTP account creation and modification requests.

Evidence notes

CVE-2026-41235 has a CVSS score of 8.6 and is considered HIGH severity.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-41235 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-41235

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-41235 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-41235

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.