Description
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.
Published: 2026-10-07
Score: 6.3 Medium
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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History

Wed, 07 Oct 2026 21:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 07 Oct 2026 15:30:00 +0000

Type Values Removed Values Added
Description 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.
Title Authenticated SMTP Sender Address Forgery
Weaknesses CWE-1188
CWE-290
CWE-346
References
Metrics cvssV4_0

{'score': 6.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:H/SA:N/E:A'}


Subscriptions

No data.

cve-icon MITRE

Status: PUBLISHED

Assigner: ENISA

Published:

Updated: 2026-10-07T20:27:49.038Z

Reserved: 2026-03-23T12:53:47.473Z

Link: CVE-2026-33586

cve-icon Vulnrichment

Updated: 2026-10-07T20:27:44.459Z

cve-icon NVD

Status : Received

Published: 2026-10-07T16:17:47.643

Modified: 2026-10-07T21:17:16.040

Link: CVE-2026-33586

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-07T17:15:15Z

Weaknesses