CVE-2026-54420: LiteSpeed cPanel plugin before 2.4.8 (as distributed i
CVE-2026-54420 analysis covering impact, affected products, versions, remediation, and cross-checked defender guidance.
CVE-2026-54420 is a vulnerability published by NVD on 6/14/2026.
What happened
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.
Affected products and versions
- litespeedtech litespeed cpanel plugin unspecified version (before 2.4.8)
- litespeedtech litespeed whm plugin unspecified version (before 5.3.2.0)
Severity and weakness
CVSS: HIGH 8.5. Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H.
Weaknesses: CWE-61.
Known exploitation
CISA KEV status: added 2026-06-15. 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.. Due date: 2026-06-18.
What defenders should do
- Identify whether the affected product and version range exists in production.
- Review vendor advisories and release notes before change windows.
- Patch, upgrade, disable the vulnerable component, or apply vendor mitigations.
- Verify the running version after deployment, not only the package inventory.