{"id":"CVE-2026-100718","title":"Froxlor through 2.3.10 does not enforce the mail.allow_external_domains policy in the EmailSender.add API command","summary":"Froxlor through 2.3.10 does not enforce the mail.allow_external_domains policy in the EmailSender.add API command. When an administrator has enabled the allowed-sender feature but disabled external allowed-sender domains (mail.enable_all…","severity":"high","cvss":7.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N","cwe":["CWE-276"],"vendor":"froxlor","product":"froxlor","affected":["froxlor < 2.3.12"],"published":"2026-09-26","updated":"2026-09-26","sourceUpdated":"2026-09-26T14:16:58.030","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-100718","references":[{"url":"https://github.com/froxlor/froxlor/security/advisories/GHSA-m9j6-9856-68xf","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/froxlor-before-2.3.12-authentication-bypass-via-emailsender-add","label":"disclosure@vulncheck.com"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-26T13:33:20.891Z","slug":"CVE-2026-100718","body":"## Overview\n\nFroxlor through 2.3.10 does not enforce the mail.allow_external_domains policy in the EmailSender.add API command. When an administrator has enabled the allowed-sender feature but disabled external allowed-sender domains (mail.enable_allow_sender = 1, mail.allow_external_domains = 0), an authenticated customer with API access can still use EmailSender.add to register an arbitrary external sender address for their mailbox, which is stored despite the policy. This creates a bypass between the UI/administrator configuration and the API, and — where the generated mail configuration consumes the allowed-sender table — allows a customer to authorize sender identities outside their hosted domains, facilitating sender spoofing. Fixed in 2.3.12.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":39.1,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}