CVE-2026-54420

CRITICALPre-NVD 8.59.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2026-06-15), indicating real-world exploitation has been confirmed by US federal agencies. a secondary CVSS source baseline 8.5 retained for reference (NVD's own analysis pending). Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, secondary
Trending — 4 sources updated this weekExploited in the wild
9.0EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 1%CVSS: 8.5Exploit: cisa kev · public exploitExposed: 0

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

LiteSpeed cPanel plugin before 2.4.8 (as distributed in LiteSpeed WHM PlugIn before 5.3.2.0) mishandles symlinks provided by a user with FTP or web shell access on a shared hosting server running CloudLinux/CageFS, as exploited in the wild in May 2026.

CVSS v3
8.5
EG Score
9.0(high)
EG Risk
81(Attend)
EG Risk 81/100SSVC: Attend

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
Severity90% × 45%
Exploitation100% × 40%
Automatability0% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
1%
EPSS %ILE
72%
KEV
⚠ Exploited

Published

June 14, 2026

Last Modified

July 23, 2026

Advisory Details (2)

Auto-updated Jun 14, 2026
⚠️ Active exploitation confirmed. No patch confirmed yet.
generic

cPanel Plugin Features - LiteSpeed Technologies

https://www.litespeedtech.com/products/litespeed-web-server/control-panel-support/cpanel
generic🔴 Active Exploitation

Security Update for LiteSpeed cPanel Plugin ⋆ LiteSpeed Blog

https://blog.litespeedtech.com/2026/06/01/security-update-for-litespeed-cpanel-plugin-2/

Vendor Advisories for CVE-2026-54420(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 56× in last 7d / 239× 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 743 total refreshes for this CVE.

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

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCmahfuzreham/litespeed-cpanel-cve-2026-54420-fix
    First seen Jun 16, 2026
    Open source ↗

Frequently asked(6)

What is CVE-2026-54420?
CVE-2026-54420 is a critical vulnerability published on June 14, 2026. LiteSpeed cPanel plugin before 2.4.8 (as distributed in LiteSpeed WHM PlugIn before 5.3.2.0) mishandles symlinks provided by a user with FTP or web shell access on a shared hosting server running CloudLinux/CageFS, as exploited in the wild in May 2026.
When was CVE-2026-54420 disclosed?
CVE-2026-54420 was first published in the National Vulnerability Database on June 14, 2026, with the most recent update on July 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-54420 actively exploited?
Yes. CISA added CVE-2026-54420 to the Known Exploited Vulnerabilities catalog on June 15, 2026, affecting LiteSpeed cPanel Plugin. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2026-54420?
CVE-2026-54420 has a CVSS v3 base score of 8.5 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2026-54420?
CVE-2026-54420 affects LiteSpeed cPanel Plugin. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2026-54420?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-54420, 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-2026-54420

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