CVE-2026-7666 – Potential unencrypted email transmission via STARTTLS in the SMTP backend

CVE ID :CVE-2026-7666

Published : June 3, 2026, 2:16 p.m. | 16 minutes ago

Description :An issue was discovered in Django 6.0 before 6.0.6 and 5.2 before 5.2.15.
`django.core.mail.backends.smtp.EmailBackend` in Django fails to prevent reuse of a partially-initialized connection after a failed `STARTTLS` handshake when `fail_silently=True`, which allows on-path network attackers to read email content via cleartext interception.
Earlier, unsupported Django series (such as 5.0.x, 4.1.x, and 3.2.x) were not evaluated and may also be affected.
Django would like to thank Kasper Dupont for reporting this issue.

Severity: 3.1 | LOW

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