CVE-2026-54420 - LiteSpeed cPanel Plugin UNIX Symbolic Link (Symlink) Following Vulnerability

Technical Severity

CVSS v3.1 Metrics

HIGH

8.5 / 10

Minimal Risk Critical

Vector Specification

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

Exploitation Likelihood

EPSS Prediction

0.65 %

Predictive Probability

Percentile Rank

46.4 th

Documented as more likely to be exploited than 46.4% of known CVEs.

Detection Date

Jun 15, 2026

Remediation Due

Jun 18, 2026

CISA Catalog Active

Threat Analysis

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.

Remediation Directive

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.

External Intelligence

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

CISA

CISA Advisory

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

CISA

CISA Advisory

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

NVD

National Vulnerability Database

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