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: 0.7%, top 49% 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
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.8Exploit: None knownExposed: 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)
EG Risk
44(Track)
EG Risk 44/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity88% × 45%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
51%
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 6× in last 7d / 62× 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.

Showing the most recent 100 of 216 total refreshes for this CVE.

  1. 2026-09-11 14:52 UTCEPSS rescore
  2. 2026-09-11 09:36 UTCEPSS rescore
  3. 2026-09-10 09:34 UTCEPSS rescore
  4. 2026-09-08 22:00 UTCEPSS rescore
  5. 2026-09-07 16:01 UTCEPSS rescore
  6. 2026-09-06 13:47 UTCEPSS rescore
  7. 2026-09-04 05:06 UTCEPSS rescore
  8. 2026-09-02 14:11 UTCEPSS rescore
  9. 2026-09-01 13:53 UTCEPSS rescore
  10. 2026-09-01 04:39 UTCEPSS rescore
  11. 2026-08-30 20:19 UTCEG score recompute
  12. 2026-08-30 20:19 UTCGHSA enrichment
  13. 2026-08-30 19:17 UTCEPSS rescore
  14. 2026-08-30 01:21 UTCEPSS rescore
  15. 2026-08-28 21:40 UTCEPSS rescore
  16. 2026-08-28 04:50 UTCEG score recompute
  17. 2026-08-28 04:49 UTCGHSA enrichment
  18. 2026-08-27 14:24 UTCEPSS rescore
  19. 2026-08-25 13:48 UTCEPSS rescore
  20. 2026-08-25 01:07 UTCEG score recompute
  21. 2026-08-25 01:07 UTCGHSA enrichment
  22. 2026-08-24 13:46 UTCEG score recompute
  23. 2026-08-24 13:46 UTCGHSA enrichment
  24. 2026-08-23 23:40 UTCGHSA enrichment
  25. 2026-08-23 12:19 UTCGHSA enrichment
Show 75 more
  1. 2026-08-23 00:56 UTCEG score recompute
  2. 2026-08-23 00:56 UTCGHSA enrichment
  3. 2026-08-23 00:19 UTCEPSS rescore
  4. 2026-08-22 13:10 UTCEG score recompute
  5. 2026-08-22 13:10 UTCGHSA enrichment
  6. 2026-08-21 23:48 UTCEPSS rescore
  7. 2026-08-21 17:41 UTCGHSA enrichment
  8. 2026-08-21 06:18 UTCEG score recompute
  9. 2026-08-21 06:18 UTCGHSA enrichment
  10. 2026-08-20 22:55 UTCEPSS rescore
  11. 2026-08-20 18:56 UTCGHSA enrichment
  12. 2026-08-20 07:34 UTCEG score recompute
  13. 2026-08-20 07:34 UTCGHSA enrichment
  14. 2026-08-19 17:03 UTCEPSS rescore
  15. 2026-08-19 13:43 UTCGHSA enrichment
  16. 2026-08-19 02:17 UTCEG score recompute
  17. 2026-08-19 02:16 UTCGHSA enrichment
  18. 2026-08-18 13:48 UTCEPSS rescore
  19. 2026-08-17 14:03 UTCEG score recompute
  20. 2026-08-17 14:03 UTCGHSA enrichment
  21. 2026-08-17 02:42 UTCGHSA enrichment
  22. 2026-08-16 15:20 UTCEG score recompute
  23. 2026-08-16 15:20 UTCGHSA enrichment
  24. 2026-08-16 14:56 UTCEPSS rescore
  25. 2026-08-16 03:58 UTCEG score recompute
  26. 2026-08-16 03:58 UTCGHSA enrichment
  27. 2026-08-16 02:14 UTCEPSS rescore
  28. 2026-08-15 16:37 UTCGHSA enrichment
  29. 2026-08-15 05:14 UTCEG score recompute
  30. 2026-08-15 05:14 UTCGHSA enrichment
  31. 2026-08-15 01:30 UTCEPSS rescore
  32. 2026-08-14 17:52 UTCGHSA enrichment
  33. 2026-08-14 06:31 UTCEG score recompute
  34. 2026-08-14 06:31 UTCGHSA enrichment
  35. 2026-08-13 22:00 UTCEPSS rescore
  36. 2026-08-13 19:09 UTCGHSA enrichment
  37. 2026-08-13 07:48 UTCGHSA enrichment
  38. 2026-08-12 19:50 UTCEG score recompute
  39. 2026-08-12 19:50 UTCGHSA enrichment
  40. 2026-08-12 13:50 UTCEPSS rescore
  41. 2026-08-12 08:29 UTCGHSA enrichment
  42. 2026-08-11 21:07 UTCEG score recompute
  43. 2026-08-11 21:07 UTCGHSA enrichment
  44. 2026-08-11 13:42 UTCEPSS rescore
  45. 2026-08-11 09:46 UTCEG score recompute
  46. 2026-08-11 09:46 UTCGHSA enrichment
  47. 2026-08-10 23:59 UTCEPSS rescore
  48. 2026-08-10 22:24 UTCGHSA enrichment
  49. 2026-08-10 11:02 UTCGHSA enrichment
  50. 2026-08-09 23:39 UTCEG score recompute
  51. 2026-08-09 23:39 UTCGHSA enrichment
  52. 2026-08-09 13:46 UTCEPSS rescore
  53. 2026-08-09 12:18 UTCGHSA enrichment
  54. 2026-08-09 00:56 UTCEG score recompute
  55. 2026-08-09 00:56 UTCGHSA enrichment
  56. 2026-08-08 16:37 UTCEPSS rescore
  57. 2026-08-08 13:34 UTCGHSA enrichment
  58. 2026-08-08 02:12 UTCEG score recompute
  59. 2026-08-08 02:12 UTCGHSA enrichment
  60. 2026-08-07 14:50 UTCGHSA enrichment
  61. 2026-08-07 03:29 UTCGHSA enrichment
  62. 2026-08-06 16:08 UTCEG score recompute
  63. 2026-08-06 16:08 UTCGHSA enrichment
  64. 2026-08-06 13:46 UTCEPSS rescore
  65. 2026-08-06 04:43 UTCEG score recompute
  66. 2026-08-06 04:43 UTCGHSA enrichment
  67. 2026-08-05 19:17 UTCEPSS rescore
  68. 2026-08-05 17:22 UTCGHSA enrichment
  69. 2026-08-05 02:35 UTCGHSA enrichment
  70. 2026-08-04 15:12 UTCEG score recompute
  71. 2026-08-04 15:12 UTCGHSA enrichment
  72. 2026-08-04 15:09 UTCEPSS rescore
  73. 2026-08-04 10:38 UTCEPSS rescore
  74. 2026-08-04 01:30 UTCGHSA enrichment
  75. 2026-08-03 14:08 UTCEG score recompute

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 1% probability of exploitation in the next 30 days, which ranks it in the top 48.5% of all scored CVEs.
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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