CVE-2026-56020

HIGHPre-NVD 8.18.1—
EchelonGraph scoreMEDIUM confidence

Score 8.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-06-18. a secondary CVSS source baseline 8.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
8.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.1Exploit: NoneExposed: 0

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

The Webmin HTTP server (miniserv.pl) allows unauthenticated attackers to impersonate any user with a configured SSL client certificate by sending a forged HTTP header. A remote attacker can spoof certificate DNs and authenticate as any user. Fixed in 2.641.

CVSS v3
8.1
EG Score
8.1(medium)
EG Risk
41(Track)
EG Risk 41/100SSVC: 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
Severity81% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
20.6%
KEV
Not listed

Published

June 18, 2026

Last Modified

June 22, 2026

Advisory Details (3)

Auto-updated Jun 18, 2026
Patch available. Sources: github_release.
generic
https://www.cve.org/CVERecord?id=CVE-2026-56020
generic

Security | Webmin

https://webmin.com/security/#webmin-prior-to-2641
github_release Patch Available

2.641

Patch available: webmin/webmin 2.641

https://github.com/webmin/webmin/releases/tag/2.641

Vendor Advisories for CVE-2026-56020(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 8× in last 7d / 89× 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 103 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-56020?
CVE-2026-56020 is a high vulnerability published on June 18, 2026. The Webmin HTTP server (miniserv.pl) allows unauthenticated attackers to impersonate any user with a configured SSL client certificate by sending a forged HTTP header. A remote attacker can spoof certificate DNs and authenticate as any user. Fixed in 2.641.
When was CVE-2026-56020 disclosed?
CVE-2026-56020 was first published in the National Vulnerability Database on June 18, 2026, with the most recent update on June 22, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-56020 actively exploited?
CVE-2026-56020 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 20.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-56020?
CVE-2026-56020 has a CVSS v3 base score of 8.1 (NVD).
How do I remediate CVE-2026-56020?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-56020, 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

Explore the affected products and dependency analysis for CVE-2026-56020

Explore →

Is Your Infrastructure Affected by CVE-2026-56020?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs