`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.
Analysis and contextual insights are available on OpenCVE Cloud.
No vendor fix or workaround currently provided.
Additional remediation guidance may be available on OpenCVE Cloud.
Tracking
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Fri, 05 Jun 2026 13:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| CPEs | cpe:2.3:a:djangoproject:django:*:*:*:*:*:*:*:* |
Thu, 04 Jun 2026 00:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Weaknesses | CWE-325 | |
| References |
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| Metrics |
threat_severity
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threat_severity
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Wed, 03 Jun 2026 16:30:00 +0000
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ssvc
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Wed, 03 Jun 2026 15:45:00 +0000
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| First Time appeared |
Djangoproject
Djangoproject django |
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| Vendors & Products |
Djangoproject
Djangoproject django |
Wed, 03 Jun 2026 14:15:00 +0000
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| 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. | |
| Title | Potential unencrypted email transmission via STARTTLS in the SMTP backend | |
| Weaknesses | CWE-319 | |
| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: DSF
Published:
Updated: 2026-06-03T15:43:34.012Z
Reserved: 2026-05-01T19:59:31.353Z
Link: CVE-2026-7666
Updated: 2026-06-03T15:43:30.919Z
Status : Analyzed
Published: 2026-06-03T14:16:47.087
Modified: 2026-06-05T12:46:04.293
Link: CVE-2026-7666
OpenCVE Enrichment
Updated: 2026-06-04T01:45:46Z