CVE-2026-56020

HIGHPre-NVD 8.18.1—
EchelonGraph scoreHIGH 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
Trending — 3 sources updated this week
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(high)
EPSS
20.3%
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 38× in last 7d / 96× 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 03:28 UTCEG score recompute
  2. 2026-07-07 03:28 UTCGHSA enrichment
  3. 2026-07-06 16:27 UTCEPSS rescore
  4. 2026-07-06 16:27 UTCEPSS rescore
  5. 2026-07-06 15:33 UTCEG score recompute
  6. 2026-07-06 15:33 UTCGHSA enrichment
  7. 2026-07-06 03:34 UTCEG score recompute
  8. 2026-07-06 03:34 UTCGHSA enrichment
  9. 2026-07-06 02:23 UTCEPSS rescore
  10. 2026-07-06 02:23 UTCEPSS rescore
  11. 2026-07-05 15:14 UTCEG score recompute
  12. 2026-07-05 15:14 UTCGHSA enrichment
  13. 2026-07-05 03:19 UTCEG score recompute
  14. 2026-07-05 03:19 UTCGHSA enrichment
  15. 2026-07-05 02:31 UTCEPSS rescore
  16. 2026-07-05 02:30 UTCEPSS rescore
  17. 2026-07-04 15:22 UTCEG score recompute
  18. 2026-07-04 15:22 UTCGHSA enrichment
  19. 2026-07-04 06:31 UTCEPSS rescore
  20. 2026-07-04 06:31 UTCEPSS rescore
  21. 2026-07-04 03:23 UTCEG score recompute
  22. 2026-07-04 03:23 UTCGHSA enrichment
  23. 2026-07-03 15:28 UTCEG score recompute
  24. 2026-07-03 15:28 UTCGHSA enrichment
  25. 2026-07-03 03:34 UTCEG score recompute
Show 71 more
  1. 2026-07-03 03:33 UTCGHSA enrichment
  2. 2026-07-02 15:38 UTCEG score recompute
  3. 2026-07-02 15:38 UTCGHSA enrichment
  4. 2026-07-02 03:44 UTCEG score recompute
  5. 2026-07-02 03:43 UTCGHSA enrichment
  6. 2026-07-01 15:49 UTCEG score recompute
  7. 2026-07-01 15:49 UTCGHSA enrichment
  8. 2026-07-01 15:07 UTCEPSS rescore
  9. 2026-07-01 03:53 UTCEG score recompute
  10. 2026-07-01 03:53 UTCGHSA enrichment
  11. 2026-06-30 23:22 UTCEPSS rescore
  12. 2026-06-30 15:58 UTCEG score recompute
  13. 2026-06-30 15:58 UTCGHSA enrichment
  14. 2026-06-30 03:57 UTCEG score recompute
  15. 2026-06-30 03:57 UTCGHSA enrichment
  16. 2026-06-29 16:02 UTCEG score recompute
  17. 2026-06-29 16:02 UTCGHSA enrichment
  18. 2026-06-29 14:06 UTCEPSS rescore
  19. 2026-06-29 14:06 UTCEPSS rescore
  20. 2026-06-29 04:07 UTCEG score recompute
  21. 2026-06-29 04:07 UTCGHSA enrichment
  22. 2026-06-28 16:10 UTCEG score recompute
  23. 2026-06-28 16:10 UTCGHSA enrichment
  24. 2026-06-28 14:07 UTCEPSS rescore
  25. 2026-06-28 04:56 UTCEPSS rescore
  26. 2026-06-28 04:56 UTCEPSS rescore
  27. 2026-06-28 04:16 UTCEG score recompute
  28. 2026-06-28 04:15 UTCGHSA enrichment
  29. 2026-06-27 16:20 UTCEG score recompute
  30. 2026-06-27 16:20 UTCGHSA enrichment
  31. 2026-06-27 04:25 UTCEG score recompute
  32. 2026-06-27 04:25 UTCGHSA enrichment
  33. 2026-06-27 03:08 UTCEPSS rescore
  34. 2026-06-26 16:31 UTCEG score recompute
  35. 2026-06-26 16:30 UTCGHSA enrichment
  36. 2026-06-26 04:36 UTCEG score recompute
  37. 2026-06-26 04:35 UTCGHSA enrichment
  38. 2026-06-25 16:37 UTCEG score recompute
  39. 2026-06-25 16:36 UTCGHSA enrichment
  40. 2026-06-25 13:49 UTCEPSS rescore
  41. 2026-06-25 04:40 UTCEG score recompute
  42. 2026-06-25 04:39 UTCGHSA enrichment
  43. 2026-06-24 16:43 UTCEG score recompute
  44. 2026-06-24 16:43 UTCGHSA enrichment
  45. 2026-06-24 14:05 UTCEPSS rescore
  46. 2026-06-24 04:49 UTCEG score recompute
  47. 2026-06-24 04:48 UTCGHSA enrichment
  48. 2026-06-23 21:33 UTCEPSS rescore
  49. 2026-06-23 21:33 UTCEPSS rescore
  50. 2026-06-23 16:51 UTCEG score recompute
  51. 2026-06-23 16:51 UTCGHSA enrichment
  52. 2026-06-23 04:55 UTCEG score recompute
  53. 2026-06-23 04:54 UTCGHSA enrichment
  54. 2026-06-22 16:59 UTCEG score recompute
  55. 2026-06-22 16:59 UTCGHSA enrichment
  56. 2026-06-22 05:05 UTCEG score recompute
  57. 2026-06-22 05:04 UTCGHSA enrichment
  58. 2026-06-21 17:08 UTCEG score recompute
  59. 2026-06-21 17:08 UTCGHSA enrichment
  60. 2026-06-21 05:13 UTCEG score recompute
  61. 2026-06-21 05:13 UTCGHSA enrichment
  62. 2026-06-20 17:16 UTCEG score recompute
  63. 2026-06-20 17:16 UTCGHSA enrichment
  64. 2026-06-20 05:19 UTCEG score recompute
  65. 2026-06-20 05:19 UTCGHSA enrichment
  66. 2026-06-19 17:16 UTCEG score recompute
  67. 2026-06-19 17:16 UTCGHSA enrichment
  68. 2026-06-19 05:21 UTCEG score recompute
  69. 2026-06-19 05:21 UTCGHSA enrichment
  70. 2026-06-18 17:26 UTCEG score recompute
  71. 2026-06-18 17:24 UTCNVD updatefirst tracked

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 20.3% 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.

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