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

Q: How do I fix CVE-2026-54420?

litespeed cpanel plugin: upgrade to 2.4.8; litespeed whm plugin: upgrade to 5.3.2.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-54420 being exploited?

Yes. CVE-2026-54420 is on the CISA Known Exploited Vulnerabilities list, so treat it as patch-now.

Q: What does CVE-2026-54420 affect?

CVE-2026-54420 affects litespeed cpanel plugin, litespeed whm plugin. Severity is high (CVSS 8.5). 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

Q: How urgent is CVE-2026-54420?

Priority 73/100. High severity; Exploited in the wild (CISA KEV)

Patch now

HIGH 8.5EXPLOITEDUPGRADEUPGRADE

CVE-2026-54420 is a high-severity flaw (CVSS 8.5) affecting litespeed cpanel plugin, litespeed whm plugin, reported as exploited in the wild. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
Exploited in the wild (CISA KEV)

A fixed release or distro patch exists.

Risk facts

CVSS score	8.5 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	Low
User interaction	None
EPSS exploit chance	1.4% (top 27%)
CISA exploited list	Yes, fix due 2026-06-18
Weakness	CWE-61
Published	2026-06-14
Last modified	2026-07-23

Publisher (CNA): MITRE · Vendor: litespeedtech

Last updated 2026-07-23 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-14 04:16 UTCPublished CVE record published
2026-06-15Exploited Added to the CISA Known Exploited Vulnerabilities list
2026-06-18Deadline CISA due date for US federal agencies to patch
2026-07-23 09:10 UTCUpdated Record last modified

litespeedtech litespeed cpanel plugin UPGRADE

Affected: < 2.4.8

Fixed in: 2.4.8

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy litespeed-cpanel-plugin || rpm -q litespeed-cpanel-plugin || litespeed-cpanel-plugin --version

2. UPGRADE to 2.4.8 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade litespeed-cpanel-plugin

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade litespeed-cpanel-plugin

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

litespeedtech litespeed whm plugin UPGRADE

Affected: < 5.3.2.0

Fixed in: 5.3.2.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy litespeed-whm-plugin || rpm -q litespeed-whm-plugin || litespeed-whm-plugin --version

2. UPGRADE to 5.3.2.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade litespeed-whm-plugin

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade litespeed-whm-plugin

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Exact fixes by distribution

Fedora 46 · ruff · FIXED · 0.17.3-1.fc46 · FEDORA-2026-63898fdcbb · source

sudo dnf upgrade --advisory=FEDORA-2026-63898fdcbb

Fedora ELN · xorg-x11-server-Xwayland · FIXED · 26.0.99.903-2.eln159 · FEDORA-2026-4581dab0ed · source

sudo dnf upgrade --advisory=FEDORA-2026-4581dab0ed

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

GitHub PoC: mahfuzreham/litespeed-cpanel-cve-2026-54420-fix (3 stars)
GitHub PoC: HORKimhab/CVE-2026-54420 (1 stars)
GitHub PoC: Resellnom/litespeed-cpanel-cve-2026-54420-fix (0 stars)

Verify at the official source NVD · CVE Program · CISA KEV catalog · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-54420?

litespeed cpanel plugin: upgrade to 2.4.8; litespeed whm plugin: upgrade to 5.3.2.0. Exact commands for each OS are on this page.

Is CVE-2026-54420 being exploited?

Yes. CVE-2026-54420 is on the CISA Known Exploited Vulnerabilities list, so treat it as patch-now.

What does CVE-2026-54420 affect?

CVE-2026-54420 affects litespeed cpanel plugin, litespeed whm plugin. Severity is high (CVSS 8.5). 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

How urgent is CVE-2026-54420?

Priority 73/100. High severity; Exploited in the wild (CISA KEV)

References

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