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 — 3 sources updated this weekExploited in the wild
9.0EG
EchelonGraph verdictMitigate nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 0.8%CVSS: 8.5Exploit: cisa kev · public exploitExposed services: Not assessed

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

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
9.0CRITICALhigh confidence
EG Risk
81
EG Risk 81/100CISA SSVC

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%
CISA SSVC: Track at low, Attend at medium and Act at high mission impact.
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low, sooner than that at medium and as soon as possible at high mission impact, and watch the vendor's advisory for the fix.
EPSS PROB
0.8%
EPSS %ILE
55th
KEV
⚠ Exploited

CISA SSVCTrack at low, Attend at medium and Act at high mission impact.

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low, sooner than that at medium and as soon as possible at high mission impact, and watch the vendor's advisory for the fix.

Exploitation active (CISA KEV listing) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

June 14, 2026

Last Modified

July 23, 2026

Advisory Details (2)

Auto-updated Jun 14, 2026
⚠️ Active exploitation confirmed. No fix on record 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 57× in last 7d / 237× 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 909 total refreshes for this CVE.

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

Related CVEs(same CWE)

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 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 attention. No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation, and watch the vendor's advisory for the fix.
What is the CVSS score of CVE-2026-54420?
CVE-2026-54420 has a CVSS base score of 8.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0 (CRITICAL).
Which products are affected by CVE-2026-54420?
CVE-2026-54420 affects LiteSpeed cPanel Plugin.
How do I remediate CVE-2026-54420?
No fix for CVE-2026-54420 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-54420 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-54420

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