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9.4
CVE-2026-100716: Froxlor 2.3.10 and earlier lets user change system files
CVE-2026-100716 · published 23 days ago
Summary
The Froxlor control panel versions up to 2.3.10 let a logged‑in customer schedule a data export that can be redirected through a symbolic link. When the scheduled job runs, it changes the ownership of any linked directory—potentially system folders like /etc—to the customer's account, giving them control over the whole server. Upgrade to Froxlor 2.3.12 or later, or disable the export feature until the update is applied.
What to do
- Update froxlor froxlor to version 2.3.12 or later.
Affected software
| Vendor | Product | Affected versions |
|---|---|---|
| froxlor | froxlor | < 2.3.12 |
Original advisory text
Froxlor before 2.3.12 Privilege Escalation via Symlink
Froxlor is a server administration panel. In versions 2.3.10 and earlier, the customer data-export (DataDump) cron fails to validate intermediate path components of the export destination: Froxlor\FileDir::makeCorrectDir() contains an off-by-one in its path-component walk that skips the first segment below the customer home directory, and the guard in ExportCron.php checks only the final component with is_link(). An authenticated customer whose account has the export feature enabled can schedule an export into a genuine subdirectory of their own webspace, then replace an intermediate path component with a symlink before the root-owned cron runs. The cron's `chown -R` then recursively changes ownership of the linked directory tree — for example /etc — to the customer's UID, yielding host root and cross-tenant compromise. Exploitation is deterministic and requires no race. This is an incomplete fix of GHSA-75h4-... The issue is fixed in Froxlor 2.3.12.
References
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/100xxx/CVE-2026-1007... Vendor Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2026-100716 Vendor Advisory
- https://github.com/froxlor/froxlor/security/advisories/GHSA-2wjc-6mgx-hq42
- https://www.vulncheck.com/advisories/froxlor-before-2.3.12-privilege-escalation-...
Internet-facing
14 days
Internal
At next upgrade
- Not known to be exploited
- Needs hands-on effort to exploit
- Gives an attacker full control
Severity
9.4
Critical
Type
CWE-59Link Following
Timeline
Published26 Sep 2026
Updated19 Oct 2026
First seen26 Sep 2026
Sources
CVE-2026-100716 · NVD
CVE-2026-100716 · MITRE
CVE-2026-100716 · OSV
GHSA-2wjc-6mgx-hq42 · GHSA
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