Required actionApply 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.
CWECWE-367CWE-61
Descriptions
KEV: LiteSpeed cPanel plugin contains a UNIX symbolic link (Symlink) following vulnerability that could allow a user with FTP or web shell access on a shared hosting server running CloudLinux/CageFS.
Look for local privilege escalation attempts via symlink following in LiteSpeed cPanel plugin before 2.4.8 on CloudLinux/CageFS shared hosting servers with FTP or web shell access.
Research details
ComponentLiteSpeed cPanel plugin symlink handling (versions before 2.4.8)
PreconditionsLocal user-level access (FTP or web shell) on a shared hosting server running CloudLinux/CageFS with LiteSpeed cPanel plugin versions before 2.4.8 (distributed in LiteSpeed WHM PlugIn before 5.3.2.0). Attacker creates a malicious symlink that the plugin follows with elevated privileges. agent
Exploit notesCVSS 8.5. Requires existing user-level access (FTP or web shell) on a shared hosting server running CloudLinux/CageFS. The LiteSpeed cPanel plugin mishandles symlinks, following them with elevated privileges. Attacker creates a malicious symlink that points to a protected system file (e.g., /etc/shadow or sshd_config) which the plugin then reads or modifies with higher permissions.
SummaryCVE-2026-54420 is a privilege escalation vulnerability (CWE-61/CWE-367, CVSS 8.5) in LiteSpeed cPanel plugin versions before 2.4.8 (distributed in LiteSpeed WHM PlugIn before 5.3.2.0). The plugin mishandles symlinks provided by a user with FTP or web shell access on shared hosting servers running CloudLinux/CageFS, allowing local privilege escalation. Exploited in the wild since May 2026. Added to CISA KEV on June 15, 2026.
Tia coverage
First reported2026-05-23
First exploit report2026-06-16
Exploit report → KEV1 days after the listing
When Tia's reporting first covered this CVE and whether a report claimed exploitation before the KEV listing. Lead-time deltas are measured from the exploitation report only — plain coverage is not exploitation intel. See the story links under Mentioned in for coverage detail.