Vulnerability in Froxlor
CVE-2026-100716
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/froxlor/froxlor/security/advisories/GHSA-2wjc-6mgx-hq42 (vendor-advisory)
- www.vulncheck.com/advisories/froxlor-before-2.3.12-privilege-escalation-via-sym… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-100716?
- CVE-2026-100716 is a critical-severity vulnerability in Froxlor, classified under Improper Link Resolution Before File Access. CVSS score: 9.9/10. Published 2026-09-26.
- How severe is CVE-2026-100716?
- Critical severity. CVSS v3 base score is 9.9 out of 10.