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

criticalknown exploitedpublic exploitCVE-2026-54420
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as 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.

CSIRTS triage

vendor: LiteSpeedproduct: cPanel PluginOther
What
The vulnerability allows a user with FTP or web shell access to exploit the symlink following issue.
Who is affected
Users with FTP or web shell access on shared hosting servers running CloudLinux/CageFS.
Urgency
Remediation is urgent as the vulnerability is critical and actively exploited.
Action
Update the LiteSpeed cPanel plugin to the latest version.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2026-06-15
Exploitation
Observed in the wild (CISA KEV)

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

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-54420coverage & exploitation statusNVD · CVE.org

Recent advisories for LiteSpeed cPanel Plugin

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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