RCE in Fuomag9 Caddy-Proxy-Manager
CVE-2026-54907
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.
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.
Affected products
- Fuomag9 Caddy-proxy-manager — versions < 1.5.1
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-54907?
- CVE-2026-54907 is a medium-severity vulnerability in Fuomag9 Caddy-Proxy-Manager, classified under Initialization of a Resource with an Insecure Default. CVSS score: 5.3/10. Published 2026-09-17.
- How severe is CVE-2026-54907?
- Medium severity. CVSS v3 base score is 5.3 out of 10.