CVE-2026-13164

HIGHPre-NVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.8 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 67% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 3 sources updated this week
8.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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

CVSS v3
8.8
EG Score
8.8(medium)
EPSS
32.5%
KEV
Not listed

Published

June 24, 2026

Last Modified

June 25, 2026

Advisory Details (2)

Auto-updated Jun 24, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit.
generic

CVE-2026-13164 · Unauthenticated self-registration in MailerUp allows access to stored email data | Vulnerabilities published by Secur0

https://secur0.com/en/cna/cve-list/cve-2026-13164-unauthenticated-self-registration-in-mailerup-allows-access-to-stored-email-data
github_commit

commit 99eb6d458613 (Maalfer/mailerup)

Fix landed in Maalfer/mailerup commit 99eb6d458613 — awaiting tagged release

https://github.com/Maalfer/mailerup/commit/99eb6d4586134bf3f4422093fbf47d6794ef0ee5

Vendor Advisories for CVE-2026-13164(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 38× in last 7d / 68× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-07 01:53 UTCEG score recompute
  2. 2026-07-07 01:53 UTCGHSA enrichment
  3. 2026-07-06 16:27 UTCEPSS rescore
  4. 2026-07-06 14:27 UTCEG score recompute
  5. 2026-07-06 14:27 UTCGHSA enrichment
  6. 2026-07-06 03:04 UTCEG score recompute
  7. 2026-07-06 03:04 UTCGHSA enrichment
  8. 2026-07-06 02:23 UTCEPSS rescore
  9. 2026-07-05 15:40 UTCEG score recompute
  10. 2026-07-05 15:40 UTCGHSA enrichment
  11. 2026-07-05 04:18 UTCEG score recompute
  12. 2026-07-05 04:18 UTCGHSA enrichment
  13. 2026-07-05 02:30 UTCEPSS rescore
  14. 2026-07-05 02:30 UTCEPSS rescore
  15. 2026-07-04 16:53 UTCEG score recompute
  16. 2026-07-04 16:53 UTCGHSA enrichment
  17. 2026-07-04 06:31 UTCEPSS rescore
  18. 2026-07-04 05:31 UTCEG score recompute
  19. 2026-07-04 05:31 UTCGHSA enrichment
  20. 2026-07-03 18:08 UTCEG score recompute
  21. 2026-07-03 18:08 UTCGHSA enrichment
  22. 2026-07-03 06:42 UTCEG score recompute
  23. 2026-07-03 06:42 UTCGHSA enrichment
  24. 2026-07-02 19:19 UTCEG score recompute
  25. 2026-07-02 19:18 UTCGHSA enrichment
Show 43 more
  1. 2026-07-02 07:56 UTCEG score recompute
  2. 2026-07-02 07:56 UTCGHSA enrichment
  3. 2026-07-01 20:34 UTCEG score recompute
  4. 2026-07-01 20:34 UTCGHSA enrichment
  5. 2026-07-01 15:06 UTCEPSS rescore
  6. 2026-07-01 15:06 UTCEPSS rescore
  7. 2026-07-01 09:13 UTCEG score recompute
  8. 2026-07-01 09:13 UTCGHSA enrichment
  9. 2026-06-30 23:22 UTCEPSS rescore
  10. 2026-06-30 21:51 UTCEG score recompute
  11. 2026-06-30 21:51 UTCGHSA enrichment
  12. 2026-06-30 10:29 UTCEG score recompute
  13. 2026-06-30 10:29 UTCGHSA enrichment
  14. 2026-06-29 23:08 UTCEG score recompute
  15. 2026-06-29 23:08 UTCGHSA enrichment
  16. 2026-06-29 14:06 UTCEPSS rescore
  17. 2026-06-29 11:46 UTCEG score recompute
  18. 2026-06-29 11:46 UTCGHSA enrichment
  19. 2026-06-29 00:24 UTCEG score recompute
  20. 2026-06-29 00:24 UTCGHSA enrichment
  21. 2026-06-28 14:07 UTCEPSS rescore
  22. 2026-06-28 13:02 UTCEG score recompute
  23. 2026-06-28 13:02 UTCGHSA enrichment
  24. 2026-06-28 04:56 UTCEPSS rescore
  25. 2026-06-28 04:56 UTCEPSS rescore
  26. 2026-06-28 01:41 UTCEG score recompute
  27. 2026-06-28 01:41 UTCGHSA enrichment
  28. 2026-06-27 14:19 UTCEG score recompute
  29. 2026-06-27 14:19 UTCGHSA enrichment
  30. 2026-06-27 03:08 UTCEPSS rescore
  31. 2026-06-27 02:57 UTCEG score recompute
  32. 2026-06-27 02:57 UTCGHSA enrichment
  33. 2026-06-26 15:36 UTCEG score recompute
  34. 2026-06-26 15:35 UTCGHSA enrichment
  35. 2026-06-26 04:13 UTCEG score recompute
  36. 2026-06-26 04:13 UTCGHSA enrichment
  37. 2026-06-25 16:51 UTCEG score recompute
  38. 2026-06-25 16:51 UTCGHSA enrichment
  39. 2026-06-25 13:49 UTCEPSS rescore
  40. 2026-06-25 05:29 UTCEG score recompute
  41. 2026-06-25 05:28 UTCGHSA enrichment
  42. 2026-06-24 18:05 UTCEG score recompute
  43. 2026-06-24 18:02 UTCNVD updatefirst tracked

Frequently asked(5)

What is CVE-2026-13164?
CVE-2026-13164 is a high vulnerability published on June 24, 2026. 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,…
When was CVE-2026-13164 disclosed?
CVE-2026-13164 was first published in the National Vulnerability Database on June 24, 2026, with the most recent update on June 25, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-13164 actively exploited?
CVE-2026-13164 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 32.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-13164?
CVE-2026-13164 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-13164?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-13164, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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