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Vulnerability Intelligence

CVE-2026-54420

HighExploitedPublic exploit

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.

Published Jun 14, 2026 · Updated Jul 23, 2026 · Also known as EUVD-2026-36657, GHSA-3g44-c4qc-cxm8

Key Facts

Patch immediately
  • CVE-2026-54420 is a high-severity vulnerability (CVSS 8.5 v3.1) affecting Litespeed Cpanel Plugin (Litespeedtech), Litespeed Whm Plugin (Litespeedtech), cPanel Plugin and 1 more product.
  • It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jun 1, 2026. Public exploit code is available.
  • EPSS estimates a 0.8% probability of exploitation in the next 30 days.
  • Fixed versions are available, including cPanel Plugin 2.4.8, Litespeed Cpanel Plugin 2.4.8, Litespeed Whm Plugin 5.3.2.0.
  • Brandefense priority: patch immediately, because it is listed as exploited in the wild.

CVSS v3.1

8.5

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

EPSS (30-day exploit likelihood)

0.8%

Higher than 56.0% of all scored CVEs

Exploited in the wild

Yes

4 catalog listings

Public exploit code

Available

Proof-of-concept or weaponized module

Get the full CVE-2026-54420 brief as a PDF

Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.

Description

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.

Known-Exploited Catalog Listings

CatalogAddedRemediation dueRansomware use
CISA KEVJun 15, 2026Jun 18, 2026Not reported
Industry KEV feedJun 1, 2026Jun 18, 2026Not reported
CIRCL KEVJun 14, 2026Jun 18, 2026Not reported
ENISA EUVDJun 15, 2026n/aNot reported

Required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

Affected Products

4 affected entries in total
ProductAffected versionsFixed in
Litespeed Cpanel PluginLitespeedtechSee advisory2.4.8
Litespeed Whm PluginLitespeedtechSee advisory5.3.2.0
cPanel Plugin>= 2.32.4.8
WHM and cPanel PlugIn>= 2.32.4.8

Patched Releases

cPanel Plugin

2.4.8

Litespeed Cpanel Plugin

2.4.8

Litespeed Whm Plugin

5.3.2.0

WHM and cPanel PlugIn

2.4.8

Timeline

  1. Added to Industry KEV feed

    Jun 1, 2026

  2. Publicly disclosed

    Jun 14, 2026

  3. Added to CIRCL KEV

    Jun 14, 2026

  4. Added to CISA KEV

    Jun 15, 2026

  5. Added to ENISA EUVD

    Jun 15, 2026

  6. Last updated

    Jul 23, 2026

Weakness Type

  • CWE-61 UNIX Symbolic Link (Symlink) Following

References

2 more references in the full CVE brief

FAQ

Common Questions.

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