CVE-2026-54420

HIGH

8.5

CVSS Score

Published: June 14, 2026 at 03:23 AM UTC

Updated: July 23, 2026 at 07:32 PM UTC

3 products affected across 2 vendorsLitespeed Whm PluginLitespeed Cpanel PlugincPanel Plugin

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Severity

HIGH8.5

Exploitation

CISA KEV

Exploit prediction

EPSS 1%

SSVC

Active

Actively Exploited

CISA Known Exploited Vulnerabilities (KEV) Catalog

EPSS Score1.4%

EPSS (Exploit Prediction Scoring System) estimates a 1.4% chance this CVE is exploited in the wild within the next 30 days — higher than 73% of all CVEs. It complements CVSS: a high EPSS on a mid-severity CVE can still be urgent.

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.

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.

Ransomware Use

Unknown

Added to KEV

Jun 15, 2026

Remediation Due

Jun 18, 2026

136 days overdue

Notes

https://blog.litespeedtech.com/2026/06/01/security-update-for-litespeed-cpanel-plugin-2/

BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk

Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk

https://nvd.nist.gov/vuln/detail/CVE-2026-54420

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.