Auth bypass in Froxlor
CVE-2026-121434
Froxlor 2.3.0 before 2.3.15 contains a missing authorization check in the Certificates.add and Certificates.update API commands, which do not verify whether a domain's certificate is Let's Encrypt-managed. Customers with API access can overwrite the managed certificate and private key with an attacker-chosen pair, which a REBUILD_VHOST task deploys to the webserver, breaking HTTPS and desynchronizing ACME automation.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L.
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-ch7m-649m-x7xg (vendor-advisory)
- www.vulncheck.com/advisories/froxlor-2.3.0-before-2.3.15-authorization-bypass-v… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-121434?
- CVE-2026-121434 is a medium-severity vulnerability in Froxlor, classified under Missing Authorization. CVSS score: 5.4/10. Published 2026-11-03.
- How severe is CVE-2026-121434?
- Medium severity. CVSS v3 base score is 5.4 out of 10.