CVE-2025-68624 PUBLISHED

Assigner: mitre
Reserved: 19.12.2025 Published: 14.09.2026 Updated: 14.09.2026

N-able Mail Assure through April 2026 contains a design-level authorization flaw that allows an authenticated SMTP user to send outbound email using MAIL FROM addresses belonging to other tenants. When connecting to the SMTP TCP port and performing SMTP AUTH with valid credentials, the server accepts arbitrary sender domains without enforcing any domain-to-account binding. As a result, an attacker from any tenant can impersonate other tenant domains, producing messages that pass SPF and DMARC validation. NOTE: N-able's position is that the behavior is intended functionality of its shared SMTP relay architecture and that the service does not represent that it enforces per-tenant sender-domain binding.

Metrics

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
CVSS Score: 4.3

Product Status

Vendor N-able
Product Mail Assure
Versions Default: unknown
  • affected from 0 to April 2026 (incl.)

References

Problem Types

  • CWE-290 Authentication Bypass by Spoofing CWE