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
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%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%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
33%
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 13× in last 7d / 81× 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. 2026-07-27 17:41 UTCEG score recompute
  2. 2026-07-27 17:41 UTCGHSA enrichment
  3. 2026-07-27 14:13 UTCEPSS rescore
  4. 2026-07-27 03:04 UTCGHSA enrichment
  5. 2026-07-26 15:42 UTCEG score recompute
  6. 2026-07-26 15:42 UTCGHSA enrichment
  7. 2026-07-26 14:54 UTCEPSS rescore
  8. 2026-07-26 14:54 UTCEPSS rescore
  9. 2026-07-25 14:17 UTCEPSS rescore
  10. 2026-07-24 14:17 UTCEPSS rescore
  11. 2026-07-23 03:05 UTCEG score recompute
  12. 2026-07-22 14:08 UTCEPSS rescore
  13. 2026-07-21 15:24 UTCEPSS rescore
  14. 2026-07-20 17:08 UTCEPSS rescore
  15. 2026-07-19 14:30 UTCEPSS rescore
  16. 2026-07-19 02:28 UTCEPSS rescore
  17. 2026-07-18 10:04 UTCEPSS rescore
  18. 2026-07-17 01:02 UTCGHSA enrichment
  19. 2026-07-16 17:02 UTCEPSS rescore
  20. 2026-07-16 13:37 UTCGHSA enrichment
  21. 2026-07-16 02:14 UTCGHSA enrichment
  22. 2026-07-15 16:57 UTCEPSS rescore
  23. 2026-07-15 14:52 UTCGHSA enrichment
  24. 2026-07-15 03:29 UTCGHSA enrichment
  25. 2026-07-15 02:00 UTCEPSS rescore
Show 66 more
  1. 2026-07-14 16:07 UTCGHSA enrichment
  2. 2026-07-14 04:44 UTCGHSA enrichment
  3. 2026-07-13 22:30 UTCEPSS rescore
  4. 2026-07-13 17:22 UTCGHSA enrichment
  5. 2026-07-13 06:12 UTCEPSS rescore
  6. 2026-07-13 06:00 UTCGHSA enrichment
  7. 2026-07-12 18:37 UTCGHSA enrichment
  8. 2026-07-12 07:05 UTCGHSA enrichment
  9. 2026-07-12 05:46 UTCEPSS rescore
  10. 2026-07-11 19:43 UTCGHSA enrichment
  11. 2026-07-11 08:27 UTCEPSS rescore
  12. 2026-07-11 08:21 UTCGHSA enrichment
  13. 2026-07-10 20:59 UTCGHSA enrichment
  14. 2026-07-10 09:36 UTCGHSA enrichment
  15. 2026-07-09 22:12 UTCGHSA enrichment
  16. 2026-07-09 19:10 UTCEPSS rescore
  17. 2026-07-09 10:50 UTCGHSA enrichment
  18. 2026-07-08 23:25 UTCGHSA enrichment
  19. 2026-07-08 15:15 UTCEPSS rescore
  20. 2026-07-08 15:15 UTCEPSS rescore
  21. 2026-07-08 12:04 UTCGHSA enrichment
  22. 2026-07-08 00:37 UTCGHSA enrichment
  23. 2026-07-07 13:46 UTCEPSS rescore
  24. 2026-07-07 13:16 UTCGHSA enrichment
  25. 2026-07-07 01:53 UTCGHSA enrichment
  26. 2026-07-06 16:27 UTCEPSS rescore
  27. 2026-07-06 14:27 UTCGHSA enrichment
  28. 2026-07-06 03:04 UTCGHSA enrichment
  29. 2026-07-06 02:23 UTCEPSS rescore
  30. 2026-07-05 15:40 UTCGHSA enrichment
  31. 2026-07-05 04:18 UTCGHSA enrichment
  32. 2026-07-05 02:30 UTCEPSS rescore
  33. 2026-07-05 02:30 UTCEPSS rescore
  34. 2026-07-04 16:53 UTCGHSA enrichment
  35. 2026-07-04 06:31 UTCEPSS rescore
  36. 2026-07-04 05:31 UTCGHSA enrichment
  37. 2026-07-03 18:08 UTCGHSA enrichment
  38. 2026-07-03 06:42 UTCGHSA enrichment
  39. 2026-07-02 19:18 UTCGHSA enrichment
  40. 2026-07-02 07:56 UTCGHSA enrichment
  41. 2026-07-01 20:34 UTCGHSA enrichment
  42. 2026-07-01 15:06 UTCEPSS rescore
  43. 2026-07-01 15:06 UTCEPSS rescore
  44. 2026-07-01 09:13 UTCGHSA enrichment
  45. 2026-06-30 23:22 UTCEPSS rescore
  46. 2026-06-30 21:51 UTCGHSA enrichment
  47. 2026-06-30 10:29 UTCGHSA enrichment
  48. 2026-06-29 23:08 UTCGHSA enrichment
  49. 2026-06-29 14:06 UTCEPSS rescore
  50. 2026-06-29 11:46 UTCGHSA enrichment
  51. 2026-06-29 00:24 UTCGHSA enrichment
  52. 2026-06-28 14:07 UTCEPSS rescore
  53. 2026-06-28 13:02 UTCGHSA enrichment
  54. 2026-06-28 04:56 UTCEPSS rescore
  55. 2026-06-28 04:56 UTCEPSS rescore
  56. 2026-06-28 01:41 UTCGHSA enrichment
  57. 2026-06-27 14:19 UTCGHSA enrichment
  58. 2026-06-27 03:08 UTCEPSS rescore
  59. 2026-06-27 02:57 UTCGHSA enrichment
  60. 2026-06-26 15:35 UTCGHSA enrichment
  61. 2026-06-26 04:13 UTCGHSA enrichment
  62. 2026-06-25 16:51 UTCGHSA enrichment
  63. 2026-06-25 13:49 UTCEPSS rescore
  64. 2026-06-25 05:28 UTCGHSA enrichment
  65. 2026-06-24 18:05 UTCEG score recompute
  66. 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 0% probability of exploitation in the next 30 days, which ranks it in the top 66.8% 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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