Vulnerability in Litespeedtech Litespeed Cpanel Plugin
CVE-2026-54420
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.5 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.014 (73.0th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 73rd percentile — 73.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.008 · newest: 0.014 · change: +0.006
Affected products
Weakness classification (CWE)
CISA KEV (Known Exploited Vulnerabilities)
This CVE is on the CISA KEV catalog, added on . CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.
BOD 22-01 due date: .
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.
Public proof-of-concept exploits
References
- blog.litespeedtech.com/2026/06/01/security-update-for-litespeed-cpanel-plugin-2/ (Vendor Advisory)
- www.litespeedtech.com/products/litespeed-web-server/control-panel-support/cpanel (Product)
- 134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)
Frequently asked questions
- What is CVE-2026-54420?
- CVE-2026-54420 is a high-severity vulnerability in Litespeedtech Litespeed Cpanel Plugin, classified under UNIX Symbolic Link (Symlink) Following. CVSS score: 8.5/10. Published 2026-06-14.
- How severe is CVE-2026-54420?
- High severity. CVSS v3 base score is 8.5 out of 10.
- Is CVE-2026-54420 known to be exploited?
- Yes. CVE-2026-54420 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-06-15), indicating it is being actively exploited. 4 public proof-of-concept repositories are indexed.