CVE-2026-7666
Potential unencrypted email transmission via STARTTLS in the SMTP backend
- State
- Published
- Severity
- 2.3 Low
- Published
- Jun 3, 2026
- Updated
- Jun 3, 2026
- Reserved
- May 1, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 2.3 Low | CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N | DSF |
| 3.1 | 3.1 Low | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N | DSF |
Weaknesses
- CWE-319 Cleartext Transmission of Sensitive Information
Affected Products
| Product | Versions |
|---|---|
Djangodjangoproject |
|
References
- Django security archivevendor-advisory
- Django releases announcementsmailing-list
- Django security releases issued: 6.0.6 and 5.2.15vendor-advisory
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