LiteSpeed cPanel Plugin UNIX Symbolic Link (Symlink) Following Vulnerability
LiteSpeed Technologies — cPanel Plugin
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.
8.5
1.3%
Vector breakdown
- Attack vector
- Network
- Attack complexity
- High
- Privileges required
- Low
- User interaction
- None
- Scope
- Changed
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
- Published
- Jun 14, 2026
- Modified
- Jun 16, 2026
- Added to KEV
- Jun 15, 2026
- Federal patch due
- Jun 18, 2026
CISA 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.
Weakness classification
Affected packages
Proof-of-concept & exploitation references
Weaponization
Public repositories whose name or description references CVE-2026-54420, found via a live GitHub search at request time. These are community-sourced signals, not a verified working exploit - cross-check each one before relying on it, and treat higher star counts and recent activity as (weak) corroboration, not proof.
No public GitHub repositories referencing CVE-2026-54420 were found at last check. Absence here is not proof no exploit exists - see the references below for vendor advisories and write-ups.
References
Frequently asked questions
What is 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 in May 2026.
How severe is CVE-2026-54420?
CVE-2026-54420 has a CVSS base score of 8.5 out of 10 (CVSS 3.1).
Is CVE-2026-54420 actively exploited in the wild?
Yes. CVE-2026-54420 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added Jun 15, 2026, meaning CISA has confirmed evidence of active exploitation.
What is the EPSS score for CVE-2026-54420?
1.3% - meaning FIRST.org's EPSS model estimates a 1.3% probability this vulnerability will be exploited in the wild within 30 days (66% percentile among all scored CVEs).
What type of vulnerability is CVE-2026-54420?
CVE-2026-54420 is classified under CWE-61 (CWE-61 UNIX Symbolic Link (Symlink) Following).
Cross-checked against
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