Vulnerability in Litespeedtech Litespeed_cpanel_plugin

CVE-2026-54420

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…

EPSS: 0.014 (70.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.5 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H.

Affected products

Weakness classification (CWE)

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on . CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: .

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.

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2026-54420?
CVE-2026-54420 is a high-severity vulnerability in Litespeedtech Litespeed_cpanel_plugin, classified under UNIX Symbolic Link (Symlink) Following. CVSS score: 8.5/10. Published 2026-06-14.
How severe is CVE-2026-54420?
High severity. CVSS v3 base score is 8.5 out of 10.
Is CVE-2026-54420 known to be exploited?
Yes. CVE-2026-54420 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-06-15), indicating it is being actively exploited. 4 public proof-of-concept repositories are indexed.