Cloudanix VulnDB

GHSA-vmjj-qr7v-pxm6

Medium · 5.0

Froxlor has an Email Sender Alias Domain Ownership Bypass via Wrong Array Index Allows Cross-Customer Email Spoofing

CVSS

5.0

EPSS

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Published

Apr 16, 2026

CISA due date

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The record

In `EmailSender::add()`, the domain ownership validation for full email sender aliases uses the wrong array index when splitting the email address, passing the local part instead of the domain to `validateLocalDomainOwnership()`. This causes the ownership check to always pass for non-existent "domains," allowing any authenticated customer to add sender aliases for email addresses on domains belonging to other customers. Postfix's `sender_login_maps` then authorizes the attacker to send emails as those addresses.

Affected packages

Ecosystem Package Introduced Fixed

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