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    2 vulnerabilities by OVHcloud

    CVE-2026-33586 (GCVE-0-2026-33586)

    Vulnerability from nvd – Published: 2026-10-07 15:00 – Updated: 2026-10-07 20:27
    VLAI
    Title
    Authenticated SMTP Sender Address Forgery
    Summary
    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.
    Severity
    6.3 (Medium)
    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
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-10-07 20:27 UTC
    CWE
    • CWE-1188 - Initialization of a resource with an insecure default
    • CWE-346 - Origin Validation Error
    • CWE-290 - Authentication bypass by spoofing
    Assigner
    ENISA CNA under the ENISA root
    CNA scorecard B 79/100 over 35 records in the last 180 days details
    References
    Impacted products
    Vendor Product Version
    OVHcloud OVHcloud Affected: 0 , < 2026-07-20 (date)
    		Create a notification for this product.
    Credits
    Abdullah HAMED of ENGIE IT Offensive Cybersecurity Team
    Show details on NVD website
    To clipboard 

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    CVE-2026-33586 (GCVE-0-2026-33586)

    Vulnerability from cvelistv5 – Published: 2026-10-07 15:00 – Updated: 2026-10-07 20:27
    VLAI
    Title
    Authenticated SMTP Sender Address Forgery
    Summary
    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.
    Severity
    6.3 (Medium)
    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
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-10-07 20:27 UTC
    CWE
    • CWE-1188 - Initialization of a resource with an insecure default
    • CWE-346 - Origin Validation Error
    • CWE-290 - Authentication bypass by spoofing
    Assigner
    ENISA CNA under the ENISA root
    CNA scorecard B 79/100 over 35 records in the last 180 days details
    References
    Impacted products
    Vendor Product Version
    OVHcloud OVHcloud Affected: 0 , < 2026-07-20 (date)
    		Create a notification for this product.
    Credits
    Abdullah HAMED of ENGIE IT Offensive Cybersecurity Team
    Show details on NVD website
    To clipboard 

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