Incorrect authorization in Froxlor - CVE-2026-100718
Published: November 9, 2026 / Updated: November 10, 2026
Vulnerability identifier: #VU162729
CSH Severity: Low
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-100718
CWE-ID: CWE-863
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows an authenticated customer to bypass Froxlor's anti-spoofing policy by authorizing arbitrary external sender identities for a hosted mailbox.
The vulnerability exists due to missing external-domain validation in the EmailSender.add API when mail.enable_allow_sender is 1 and mail.allow_external_domains is 0. An authenticated customer with API access and a mailbox under an email-enabled domain can submit an external sender address, causing the prohibited identity to be stored as an allowed sender.
Affected software
Froxlor
How to mitigate CVE-2026-100718
Install security update from vendor's website.
Froxlor - update to 2.3.12