---
title: "CVE-2026-54420: LiteSpeed cPanel Plugin UNIX Symbolic Link (Symlink) Following Vulnerability"
url: https://erroneo.us/security/cve/CVE-2026-54420/
description: "CVE-2026-54420 (LiteSpeed cPanel Plugin): Exploited in the wild (CISA KEV). LiteSpeed cPanel plugin before 2.4.8 (as distributed in LiteSpeed WHM PlugIn…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-06-14
date_modified: 2026-06-16
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-54420"
kev: true
cvss: 8.5
epss: 0.00806
license: All rights reserved. Quote with attribution and a link.
---

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

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run LiteSpeed cPanel Plugin. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2026-06-15, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2026-06-18 ; treat that as the outer limit, not the target.
- EPSS 0.8% , percentile 56: FIRST’s model estimates a 0.8% chance of exploitation activity in the next 30 days, higher than 56% of all scored CVEs (moderate). EPSS is a probability, not a verdict.
- Needs an account (low (any account)). Exposure depends on who can log in.

## What it is

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.

## Affected products (CVE record)

- LiteSpeed Technologies cPanel Plugin: 2.3 < 2.4.8

## Severity

- mitre CVSS 3.1: 8.5 `CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H`

## Exploitation

- CISA KEV: added 2026-06-15; federal due date 2026-06-18. Known ransomware use: Unknown.
- CISA 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.
- CISA SSVC assessment: exploitation active , automatable no , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.81% probability of exploitation activity in the next 30 days; percentile 56.

## Sources

- [Listed in CISA KEV notes (blog.litespeedtech.com)](https://blog.litespeedtech.com/2026/06/01/security-update-for-litespeed-cpanel-plugin-2/)
- [CVE.org record CVE-2026-54420](https://www.cve.org/CVERecord?id=CVE-2026-54420)
- [NVD entry CVE-2026-54420](https://nvd.nist.gov/vuln/detail/CVE-2026-54420)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-54420)
- [Listed in CISA KEV notes (cisa.gov)](https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk)
- [Listed in CISA KEV notes (cisa.gov)](https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk)
- [litespeedtech.com](https://www.litespeedtech.com/products/litespeed-web-server/control-panel-support/cpanel)

---
Source page: https://erroneo.us/security/cve/CVE-2026-54420/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt