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TI-2026-11177 Aliases CVE-2026-13164GHSA-cwqp-w2pg-8772

Unauthenticated self-registration in MailerUp allows access to stored email data

Priority MEDIUM 45CWE-306Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
High · Low · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-306.

Summary

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

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0071 53rd percentileScored 2026-11-07
Fix Fixed Mailerup (Mailerup): 1.0.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
MailerupMailerupbefore 1.0.11.0.1Patch availableCNA
  • Mailerup VendorMailerup Affected before 1.0.1 Fixed in 1.0.1 Patch available CNA

Remediation

  • Fix · CNA Mailerup (Mailerup) Fixed in 1.0.1

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Mailerup 1.0.1

    2 records Highest priority Priority MEDIUM 1 MEDIUM, 1 LOW

    Other records, highest priority first

    • TI-2026-11176 Lack of input validation in Mailerup input parameter leads to Open RedirectPriority LOW 25
    Show all 2 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-13164
  2. 2026-10-03 Alias added: GHSA-cwqp-w2pg-8772

References

Patch 1

Other 1

  • TI-2026-11176 Lack of input validation in Mailerup input parameter leads to Open Redirect CVSS 4.0MEDIUM 5.3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences