CVE-2026-100714 Froxlor before 2.3.12 Command Injection via letsencryptchallengepath
Administrators or attackers with settings access can inject commands into the Let's Encrypt cron job, achieving root code execution.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-100714?
CVE-2026-100714 is a critical command injection vulnerability in froxlor, published on 26 Sep 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
Froxlor before 2.3.12 does not restrict or escape the system.letsencryptchallengepath setting: unlike sibling settings hardened in GHSA-33mp, the field has no string_regexp or required_otp guard, and its value is concatenated unescaped into the acme.sh command line built in lib/Froxlor/Cron/Http/LetsEncrypt/AcmeSh.php and executed by the root cron via FileDir::safe_exec. Because safe_exec only blacklists shell metacharacters such as ; | & > < \ $ ~ ?, spaces and quotes survive and the value is word-split into additional acme.sh arguments. An administrator, or any actor able to write settings (for example through the settings-import API), can therefore inject acme.sh options such as --renew-hook, --pre-hook or --post-hook to obtain arbitrary command execution as root at the next Let's Encrypt cron run, or use --config-home/--cert-home for arbitrary file writes. Versions up to and including 2.3.10 are affected; the issue is fixed in 2.3.12.
Weakness: CWE-88
Which versions are affected by CVE-2026-100714?
How do I fix CVE-2026-100714?
No fix has been published for CVE-2026-100714 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-100714 being exploited?
There is no known exploitation of CVE-2026-100714 in the wild and no public exploit code.
Sources
Also known as GHSA-3w4g-cmpj-rj42, GHSA-fh3h-q9pj-x5qp.