MEDIUM 6.3 NVD

CVE-2026-33586

Authenticated users are able to manipulate both the SMTP envelope “Envelope-from” and “From” fields when sending emails through OVH mail servers. Due to OVH'

Authenticated users are able to manipulate both the SMTP envelope “Envelope-from” and “From” fields when sending emails through OVH mail servers. Due to OVH's default SPF configuration, which commonly includes include:mx.ovh.com, any authenticated user with a valid OVH email account can send messages that appear to originate from any OVH-hosted domains using the default SPF record. Since the SPF policy explicitly authorizes OVH mail servers (mx.ovh.com) to send mail on behalf of these domains, forged messages successfully pass SPF validation despite not being authorized by the impersonated domain owner.

References

https://docs.ovhcloud.com/en/guides/web-cloud/email-and-collaborative-solutions/troublesho

Published: 2026-10-07 · Source: NVD · Feed updated: 2026-10-12

This medium severity vulnerability with a CVSS score of 6.3 was published on 2026-10-07 via NVD.

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