CVE-2026-100720 Froxlor before 2.3.12 Stored XSS via SSL certificate issuer
Stored XSS in Froxlor allows customers to execute scripts in admin sessions via SSL certificate issuer fields, leading to account takeover and potential root code execution.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-100720?
CVE-2026-100720 is a critical cross-site scripting vulnerability in froxlor, published on 26 Sep 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
Froxlor 2.0.0 through 2.3.10 is vulnerable to stored cross-site scripting. When a customer (the lowest-privileged authenticated role) uploads an SSL certificate for one of their own domains, the Certificates API add()/update() methods parse it with openssl_x509_parse() and store the issuer organization (issuer['O']) value verbatim without sanitization. Froxlor's table-listing renderer then emits scalar cells through Twig's `raw` filter, disabling HTML auto-escaping, so when an administrator or reseller opens Domains > SSL certificates the attacker-supplied issuer value executes as script in the privileged user's session. This crosses a privilege boundary from customer to admin and can result in full administrator account takeover; because a Froxlor admin controls webserver, DNS, and PHP configuration applied by a cron job running as root, the issue can be further escalated to command execution as root on the managed server. The issue is fixed in Froxlor 2.3.12.
Weakness: CWE-79
Which versions are affected by CVE-2026-100720?
How do I fix CVE-2026-100720?
No fix has been published for CVE-2026-100720 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-100720 being exploited?
There is no known exploitation of CVE-2026-100720 in the wild and no public exploit code.
Sources
Also known as GHSA-89vj-gqqr-73p8, GHSA-mmqp-fgp4-5q7j.