CVE-2026-33586: OVHcloud, заобикаляне на вход и права

Описание

Оригинално описание

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.

Засегнати продукти

• OVHcloud OVHcloud: преди 2026-07-20

Вид слабост

• CWE-1188 Initialization of a Resource with an Insecure Default
• CWE-346 Грешка при валидиране на произхода (Origin)
• CWE-290 Заобикаляне на автентикация чрез подправяне

История

Първоизточници

• https://www.cve.org/CVERecord?id=CVE-2026-33586
• https://nvd.nist.gov/vuln/detail/CVE-2026-33586
• https://docs.ovhcloud.com/en/guides/web-cloud/email-and-collaborative-solutions/troubleshooting/email-rejected-cross-domain-spoofing