CVE-2026-13164
Unauthenticated self-registration in MailerUp allows access to stored email data
Description
Missing Authentication for Critical Function (CWE-306) in the RegisterView (apps/accounts/views.py), exposed at POST /api/auth/register/, in MailerUp <1.0.1 allows a remote, unauthenticated attacker to self-register a working account on instances where registration is intended to be restricted, because the endpoint applies the AllowAny permission with no email verification, CAPTCHA, or administrator approval. Any account created this way can read all email stored by the instance, resulting in full disclosure of stored messages to an arbitrary unauthenticated attacker
INFO
Published Date :
June 24, 2026, 3:37 p.m.
Last Modified :
June 24, 2026, 3:37 p.m.
Remotely Exploit :
Yes !
Source :
Secur0
Affected Products
The following products are affected by CVE-2026-13164
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 4.0 | HIGH | 4daa8cea-433a-44bd-9456-53b127fc289a |
Solution
- Implement proper authentication for the registration endpoint.
- Enable email verification or admin approval for registrations.
- Restrict access to stored emails based on user roles.
- Apply necessary security patches for MailerUp.
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CVE-2026-13164 vulnerability anywhere in the article.