CyberSecBulletin
CVE-2026-54420Exploited in the wildNVD status: Analyzed

LiteSpeed cPanel Plugin UNIX Symbolic Link (Symlink) Following

Published Updated By the CyberSecBulletin desk

CVE-2026-54420 is a high-severity UNIX symbolic link (symlink) following vulnerability in cPanel Plugin from LiteSpeed Technologies, with a CVSS 3.1 base score of 8.5 out of 10. It can be exploited remotely over the network by an attacker with a low-privileged account, without any action from a user. The record lists version 2.4.8 as the first without the flaw, so updating cPanel Plugin to that release or later removes the exposure. CISA added it to the Known Exploited Vulnerabilities catalogue on June 15, 2026, which means attacks have been observed in the wild.

Patch now

Attackers are already exploiting this vulnerability, according to CISA.

What to do

  1. Update cPanel Plugin to 2.4.8 or a later version.
  2. Update Litespeed Cpanel Plugin to 2.4.8 or a later version.
  3. Update Litespeed Whm Plugin to 5.3.2.0 or a later version.
  4. CISA's 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.
  5. Read the advisory on blog.litespeedtech.com for workarounds and exact fixed builds.

Affected products and versions

VendorProductAffected versionsFixed in
LiteSpeed TechnologiescPanel Plugin2.3 up to, but not including, 2.4.82.4.8
LitespeedtechLitespeed Cpanel Pluginbefore 2.4.82.4.8
LitespeedtechLitespeed Whm Pluginbefore 5.3.2.05.3.2.0

Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
NetworkCan be exploited remotely over a network, including the internet.
Attack complexity
HighSuccess depends on conditions outside the attacker's control.
Privileges required
LowA basic user account is enough.
User interaction
NoneNo action by a victim is required.
Scope
ChangedThe attack can reach beyond the vulnerable component into other systems.
Confidentiality
HighAll data handled by the component can be read.
Integrity
HighData or code can be modified at will.
Availability
HighThe component can be taken down completely.

Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H. Scored by CNA (mitre.org).

Official 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.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: UNIX Symbolic Link (Symlink) Following

The product, when opening a file or directory, does not sufficiently account for when the file is a symbolic link that resolves to a target outside of the intended control sphere. This could allow an attacker to cause the product to operate on unauthorized files.

How developers prevent this class of flaw

  • Symbolic link attacks often occur when a program creates a tmp directory that stores files/links. Access to the directory should be restricted to the program as to prevent attackers from manipulating the files.
  • Follow the principle of least privilege when assigning access rights to entities in a software system. Denying access to a file can prevent an attacker from replacing that file with a link to a sensitive file. Ensure good compartmentalization in the system to provide protected areas that can be trusted.

More UNIX Symbolic Link (Symlink) Following vulnerabilities (CWE-61)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: active, automatable: no, technical impact: total).
  3. Added to CISA's Known Exploited Vulnerabilities catalogue.
  4. Deadline for US federal agencies to remediate, set by CISA.
  5. Record last changed materially (score, affected products, status or references).

References

Third-party and government advisories

Other vulnerabilities in cPanel Plugin

All cPanel Plugin vulnerabilities

Recent UNIX Symbolic Link (Symlink) Following vulnerabilities

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