How severe is CVE-2026-54420?

CVE-2026-54420 has a CVSS 3.x base score of 8.5, rated high severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-54420 being actively exploited?

Yes. CVE-2026-54420 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2026-06-15, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2026-54420?

CVE-2026-54420 primarily affects Litespeedtech Litespeed Cpanel Plugin. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-54420?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

Does CVE-2026-54420 have an EU (EUVD) identifier?

Yes. CVE-2026-54420 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-36657. It is also flagged as exploited in the EUVD (since 2026-06-15).

When was CVE-2026-54420 published?

CVE-2026-54420 was published on 2026-06-14 and last updated on 2026-06-17.

CVE-2026-54420

CVE-2026-54420 is a high-severity vulnerability in Litespeedtech Litespeed Cpanel Plugin with a CVSS 3.x base score of 8.5. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2026-06-15). The underlying weakness is classified as CWE-61.

Key facts

Severity: High (CVSS 3.x base score 8.5)
EPSS exploit prediction: 1% (66th percentile)
Actively exploited: Yes — listed in CISA KEV (added 2026-06-15)
EU (EUVD) id: EUVD-2026-36657
EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2026-06-15)
Weakness: CWE-61
Affected product: Litespeedtech Litespeed Cpanel Plugin
Published: 2026-06-14
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-54420?: CVE-2026-54420 has a CVSS 3.x base score of 8.5, rated high severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-54420 being actively exploited?: Yes. CVE-2026-54420 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2026-06-15, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2026-54420?: CVE-2026-54420 primarily affects Litespeedtech Litespeed Cpanel Plugin. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-54420?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
Does CVE-2026-54420 have an EU (EUVD) identifier?: Yes. CVE-2026-54420 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-36657. It is also flagged as exploited in the EUVD (since 2026-06-15).
When was CVE-2026-54420 published?: CVE-2026-54420 was published on 2026-06-14 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:a:litespeedtech:litespeed_cpanel_plugin:*:*:*:*:*:*:*:*
cpe:2.3:a:litespeedtech:litespeed_whm_plugin:*:*:*:*:*:*:*:*

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