CVE-2026-56063

HIGHPre-NVD 8.38.3—
EchelonGraph scoreMEDIUM confidence

Score 8.3 from GitHub Security Advisory (severity: HIGH) published 2026-06-26. a secondary CVSS source baseline 8.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
8.3EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.3Exploit: None knownExposed: 0

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

Unauthenticated Broken Access Control in MailChimp Block <= 1.1.15 versions.

CVSS v3
8.3
EG Score
8.3(medium)
EG Risk
42(Track)
EG Risk 42/100SSVC: 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
Severity83% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
23%
KEV
Not listed

Published

June 26, 2026

Last Modified

June 26, 2026

Advisory Details (1)

Auto-updated Jun 26, 2026
No patch confirmed yet.
generic

Broken Access Control in WordPress MailChimp Block Plugin - Patchstack

https://patchstack.com/database/wordpress/plugin/block-for-mailchimp/vulnerability/wordpress-mailchimp-block-plugin-1-1-15-broken-access-control-vulnerability?_s_id=cve

Vendor Advisories for CVE-2026-56063(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 5× in last 7d / 64× 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 213 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-56063?
CVE-2026-56063 is a high vulnerability published on June 26, 2026. Unauthenticated Broken Access Control in MailChimp Block <= 1.1.15 versions.
When was CVE-2026-56063 disclosed?
CVE-2026-56063 was first published in the National Vulnerability Database on June 26, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-56063 actively exploited?
CVE-2026-56063 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 77.5% of all scored CVEs.
What is the CVSS score of CVE-2026-56063?
CVE-2026-56063 has a CVSS v3 base score of 8.3 (NVD).
How do I remediate CVE-2026-56063?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-56063, 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.

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