Vulnerability · Published Nov 3, 2026 · Assigned by VulnCheck

CVE-2026-121434Froxlor 2.3.0 before 2.3.15 Authorization Bypass via Certificates.update API

Medium 5.4

In plain English

A medium-severity missing authorization in froxlor from froxlor. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 5% of all known vulnerabilities).

Severity (CVSS 3.1)5.4Medium

Exploit odds (30 days)0.2%top 95.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

Vendor	Product	Versions
froxlor	froxlor	2.3.0 – before 2.3.15

Weakness: CWE-862 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L

References

GitHub Security Advisory (GHSA-ch7m-649m-x7xg) vendor-advisory
VulnCheck Advisory: Froxlor 2.3.0 before 2.3.15 Authorization Bypass via Certificates.update API third-party-advisory