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
8.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.1Exploit: None knownExposed: 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 2.202.

CVSS v3
8.1
EG Score
8.1(medium)
EG Risk
37(Track)
EG Risk 37/100SSVC: 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%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
41%
KEV
Not listed

Published

June 18, 2026

Last Modified

August 11, 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 5× in last 7d / 55× 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 228 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 20:55 UTCEG score recompute
  11. 2026-08-30 20:55 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 14:25 UTCEPSS rescore
  16. 2026-08-26 14:46 UTCEPSS rescore
  17. 2026-08-25 13:49 UTCEPSS rescore
  18. 2026-08-25 02:57 UTCGHSA enrichment
  19. 2026-08-24 15:02 UTCEG score recompute
  20. 2026-08-24 15:02 UTCGHSA enrichment
  21. 2026-08-24 01:30 UTCGHSA enrichment
  22. 2026-08-23 13:29 UTCGHSA enrichment
  23. 2026-08-23 01:07 UTCEG score recompute
  24. 2026-08-23 01:07 UTCGHSA enrichment
  25. 2026-08-23 00:19 UTCEPSS rescore
Show 75 more
  1. 2026-08-21 23:49 UTCEPSS rescore
  2. 2026-08-21 19:54 UTCGHSA enrichment
  3. 2026-08-21 07:59 UTCEG score recompute
  4. 2026-08-21 07:59 UTCGHSA enrichment
  5. 2026-08-20 22:55 UTCEPSS rescore
  6. 2026-08-20 20:04 UTCGHSA enrichment
  7. 2026-08-20 08:08 UTCEG score recompute
  8. 2026-08-20 08:08 UTCGHSA enrichment
  9. 2026-08-19 17:04 UTCEPSS rescore
  10. 2026-08-19 07:43 UTCEG score recompute
  11. 2026-08-19 07:43 UTCGHSA enrichment
  12. 2026-08-18 13:48 UTCEPSS rescore
  13. 2026-08-17 13:47 UTCEPSS rescore
  14. 2026-08-17 08:52 UTCGHSA enrichment
  15. 2026-08-16 20:58 UTCEG score recompute
  16. 2026-08-16 20:58 UTCGHSA enrichment
  17. 2026-08-16 14:56 UTCEPSS rescore
  18. 2026-08-16 09:02 UTCEG score recompute
  19. 2026-08-16 09:02 UTCGHSA enrichment
  20. 2026-08-16 02:14 UTCEPSS rescore
  21. 2026-08-15 21:08 UTCGHSA enrichment
  22. 2026-08-15 09:04 UTCEG score recompute
  23. 2026-08-15 09:04 UTCGHSA enrichment
  24. 2026-08-15 01:30 UTCEPSS rescore
  25. 2026-08-14 18:49 UTCGHSA enrichment
  26. 2026-08-14 06:55 UTCEG score recompute
  27. 2026-08-14 06:55 UTCGHSA enrichment
  28. 2026-08-13 22:00 UTCEPSS rescore
  29. 2026-08-13 19:00 UTCGHSA enrichment
  30. 2026-08-13 04:41 UTCGHSA enrichment
  31. 2026-08-12 16:47 UTCEG score recompute
  32. 2026-08-12 16:47 UTCGHSA enrichment
  33. 2026-08-12 13:51 UTCEPSS rescore
  34. 2026-08-12 04:52 UTCGHSA enrichment
  35. 2026-08-11 16:33 UTCEG score recompute
  36. 2026-08-11 16:33 UTCGHSA enrichment
  37. 2026-08-11 15:41 UTCEG score recompute
  38. 2026-08-11 15:41 UTCGHSA enrichment
  39. 2026-08-11 05:24 UTCEG score recompute
  40. 2026-08-11 05:24 UTCGHSA enrichment
  41. 2026-08-11 00:00 UTCEPSS rescore
  42. 2026-08-10 17:29 UTCGHSA enrichment
  43. 2026-08-10 05:16 UTCGHSA enrichment
  44. 2026-08-09 17:21 UTCEG score recompute
  45. 2026-08-09 17:21 UTCGHSA enrichment
  46. 2026-08-09 13:46 UTCEPSS rescore
  47. 2026-08-09 05:27 UTCGHSA enrichment
  48. 2026-08-08 17:33 UTCEG score recompute
  49. 2026-08-08 17:33 UTCGHSA enrichment
  50. 2026-08-08 16:37 UTCEPSS rescore
  51. 2026-08-08 05:38 UTCGHSA enrichment
  52. 2026-08-07 17:44 UTCEG score recompute
  53. 2026-08-07 17:44 UTCGHSA enrichment
  54. 2026-08-07 05:49 UTCGHSA enrichment
  55. 2026-08-06 17:55 UTCEG score recompute
  56. 2026-08-06 17:55 UTCGHSA enrichment
  57. 2026-08-06 13:47 UTCEPSS rescore
  58. 2026-08-06 06:00 UTCEG score recompute
  59. 2026-08-06 06:00 UTCGHSA enrichment
  60. 2026-08-05 19:17 UTCEPSS rescore
  61. 2026-08-05 18:05 UTCGHSA enrichment
  62. 2026-08-05 03:43 UTCGHSA enrichment
  63. 2026-08-04 15:23 UTCEG score recompute
  64. 2026-08-04 15:23 UTCGHSA enrichment
  65. 2026-08-04 15:10 UTCEPSS rescore
  66. 2026-08-04 10:39 UTCEPSS rescore
  67. 2026-08-03 22:02 UTCEG score recompute
  68. 2026-08-03 22:02 UTCGHSA enrichment
  69. 2026-08-03 10:36 UTCEPSS rescore
  70. 2026-08-03 10:07 UTCGHSA enrichment
  71. 2026-08-02 22:12 UTCGHSA enrichment
  72. 2026-08-02 10:17 UTCEG score recompute
  73. 2026-08-02 10:17 UTCGHSA enrichment
  74. 2026-08-02 02:27 UTCEPSS rescore
  75. 2026-08-01 22:23 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 2.202.
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 August 11, 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 0% probability of exploitation in the next 30 days, which ranks it in the top 59.1% of all scored CVEs.
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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