CVE-2026-54907 Caddy Proxy Manager: Registrations enabled by default allows creating users with "user" permission
Unauthenticated attackers can create low-privilege user accounts due to default self-registration settings in Caddy Proxy Manager.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-54907?
CVE-2026-54907 is a medium-severity vulnerability in fuomag9 caddy-proxy-manager, published on 17 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Caddy Proxy Manager is a web interface for managing Caddy Server reverse proxies and certificates. Prior to 1.5.1, Caddy Proxy Manager enables email and password self-registration by default at /api/auth/sign-up/email, allowing an unauthenticated remote actor to create an active account with the user role without administrator approval. The user role cannot view or modify proxy data, so the direct impact is limited to unauthorized creation of low-privilege accounts. The fixed configuration in src/lib/config.ts and src/lib/auth-server.ts requires AUTH_ALLOW_SELF_REGISTRATION=true before the authentication library's disableSignUp control permits sign-up. This issue is fixed in version 1.5.1.
Weakness: CWE-1188
Which versions are affected by CVE-2026-54907?
How do I fix CVE-2026-54907?
No fix has been published for CVE-2026-54907 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-54907 being exploited?
There is no known exploitation of CVE-2026-54907 in the wild and no public exploit code.
Sources
Also known as GHSA-4wcc-gwxr-gc9p.