CVE-2026-7666

What it is

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.

At a glance

Exploitability

Can be exploited over the network without logging in, but needs a user to act. Limited direct impact.

Exploit odds

0.1% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2026-06-03 14:16 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-07-21 19:10 UTC Last updatedMost recent change to the record

Details

Published

2026-06-03 14:16 UTC

Last modified

2026-07-21 19:10 UTC

Exploit probability

0.1% · EPSS, next 30 days

Weakness

CWE-319 · Cleartext transmission

Record status

Analyzed

Affected

• Djangoproject Django < 5.2.15
• Djangoproject Django < 6.0.6

Attack profile CVSS 4.0 · 2.3

Attack vector

Network

Complexity

High

Attack requirements

Present

Privileges needed

None

User interaction

Passive

Confidentiality

Low

Integrity

None

Availability

None