---
cve: "CVE-2026-100716"
severity: "CRITICAL"
cvss: 9.4
epss: "0.4%"
vendor: "froxlor"
kev: false
exploited: false
published: "2026-09-26 14:16:57"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-10-02T08:55:44+02:00"
---

# CVE-2026-100716

> 9.4 CRITICAL · 🧪 PoC

## Beschreibung

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.

## CNA-Record (Kanon, cvelistV5)

- CNA: **VulnCheck**
- State: PUBLISHED
- Stand: 2026-09-28 14:41:06
- CNA-CVSS: **9.4** (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H`)

## CISA-Anreicherung (vulnrichment/ADP)

- CISA-SSVC (Coordinator, v2.0.3):
  - Exploitation: **poc**
  - Automatable: **no**
  - Technical Impact: **total**

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Gering | warn |
| UI Interaktion | Keine | bad |

## Patch verfügbar (OSV)

- 143b6ee634a4b9c237437b4b1206c7b733b86d95 (Commit)

## BSI-Hinweise (deutsch)

- [Froxlor: Mehrere Schwachstellen](https://wid.cert-bund.de/portal/wid/sicherheitshinweis/WID-SEC-W-2026-3200) — _BSI-Einstufung: hoch_
  Ein entfernter, authentisierter Angreifer kann mehrere Schwachstellen in Froxlor ausnutzen, um Administratorrechte zu erlangen, um Daten zu manipulieren oder offenzulegen, sowie um Sicherheitsmechanismen zu umgehen.

## Referenzen

- <https://github.com/froxlor/froxlor/security/advisories/GHSA-2wjc-6mgx-hq42>
- <https://www.vulncheck.com/advisories/froxlor-before-2.3.12-privilege-escalation-via-symlink>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-100716) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_