CVE-2026-54420

Exp

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: 2026-06-14 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-54420 is rated Critical Active Threat (82.6/100): CVSS High severity, with medium exploitation likelihood (EPSS 1.26%). CISA KEV confirms active exploitation (added 2026-06-15) affecting LiteSpeed / cPanel Plugin. a weakness (CWE-61) Unauthenticated remote administrative access may be possible. The CISA remediation deadline has passed—treat as an emergency patch priority.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

CISA KEV Record for CVE-2026-54420

Name: LiteSpeed cPanel Plugin UNIX Symbolic Link (Symlink) Following Vulnerability · CISA KEV detail

Exploit added: 2026-06-15

Action due: 2026-06-18

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.

Exploit prediction scoring system (EPSS) score for CVE-2026-54420

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-23 0.65% 1.26% +0.61%
2 2026-06-17 0.61% 0.65% +0.04%
3 2026-06-16 — 0.61% —

Full EPSS history (5 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-54420

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.5 3.1 HIGH
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.8 6.0 [email protected]

Weakness enumeration for CVE-2026-54420

GitHub Security Advisory for CVE-2026-54420

GHSA-3g44-c4qc-cxm8 · Severity: high — LiteSpeed cPanel plugin before 2.4.8 (as distributed in LiteSpeed WHM PlugIn before 5.3.2.0)...

Affected software / configurations for CVE-2026-54420

Vendor Product Version Raw CPE
litespeedtech litespeed_cpanel_plugin < 2.4.8 cpe:2.3:a:litespeedtech:litespeed_cpanel_plugin:*:*:*:*:*:*:*:*
litespeedtech litespeed_whm_plugin < 5.3.2.0 cpe:2.3:a:litespeedtech:litespeed_whm_plugin:*:*:*:*:*:*:*:*

References for CVE-2026-54420

cvelogic Threat Intelligence