CVE-2026-100715: Froxlor arbitrary file deletion via symlink following in cron task

CVE-2026-100715 · Severity: critical · CVSS 9.6 · Published 2026-09-26

Froxlor is a web hosting control panel that manages FTP accounts and file storage for multiple customers. When an FTP account is deleted, a background cron task running as root recursively removes the account's files, but it does not properly validate symlinks. An authenticated customer can plant a malicious symlink in their FTP directory before the cleanup task runs, causing the root cron job to delete arbitrary files and directories across the system, leading to data destruction affecting other customers and server outages.

Technologies: Froxlor. Vendors: Froxlor.

Quick answers

Is CVE-2026-100715 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-100715 being exploited in the wild.
How severe is CVE-2026-100715?
Critical severity, with a CVSS score of 9.6, published 26 September 2026.
Which products and versions are affected?
Froxlor through 2.3.10.
Is there a fix for CVE-2026-100715?
A patch was published on 2026-09-26: Fixed in version 2.3.12 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-100715 attacked?
It is attacked over the network, in a web application.
Am I affected by CVE-2026-100715?
Check whether you run Froxlor at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

The vulnerability exists in the deleteFtpData cron task (task 8), which calls FileDir::makeCorrectDir() without the $fixed_homedir parameter, skipping symlink component resolution. The function then appends a trailing slash and executes 'rm -rf' as root with only string-level path validation. An authenticated customer with write access to their FTP homedir can create a symlink (intermediate or final component) that redirects the recursive deletion to arbitrary directory trees. The attack requires the customer to plant the symlink between task insertion and cron execution. Fixed in Froxlor 2.3.12.

Affected products

  • Froxlor Froxlor through 2.3.10

Timeline

  • 2026-09-26: disclosed
  • 2026-09-26: patched: Fixed in version 2.3.12

References

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