8.5

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

CVSS: 8.5v3.1HighKEVAnalyzed
Published 14-06-2026Last modified 16-06-2026
Open JSON

Vulnerability summary

CVE-2026-54420 is a high (CVSS 8.5) UNIX Symbolic Link (Symlink) Following vulnerability in LiteSpeed cPanel Plugin. It is known to be exploited: CISA lists it, first on 15-06-2026. EPSS estimates a 0.81% chance of exploitation in the next 30 days, higher than 56% of scored vulnerabilities.

Overall risk
85/100
0100
Critical · default modelHow is this calculated?
CVSS score
8.5/10
010
High · v3.1 (CVE.org)
EPSS score
0.81%
0%100%
Low · -0.63 pp in 30 days
KEVListedCISA
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 14-06-2026
    PublishedVulnerability first disclosed.
  2. 15-06-2026
    Added to CISA KEVLiteSpeed cPanel Plugin UNIX Symbolic Link (Symlink) Following Vulnerability
  3. 16-06-2026
    Last modifiedVulnerability information updated.
  4. 18-06-2026
    CISA remediation dueApply mitigations per vendor instructions.

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.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.81%

Chance of exploitation in the next 30 days

Percentile

56%

Versus all other CVEs

30-day change

-0.63 pp

From 1.44% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.81%

Known exploited

Compare KEV catalogs
CISA KEVListed
Added
15-06-2026
Federal due date
18-06-2026

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. blog.litespeedtech.com/2026/06/01/security-update-for-litespeed-cpanel-plugin-2/ nvd.nist.gov/vuln/detail/CVE-2026-54420

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Litespeedtech2 products
Litespeed technologies1 product

2 vendors · 3 products

References

3 links