Is CVE-2026-54420 in the CISA KEV catalog?

Yes. CVE-2026-54420 is on the CISA Known Exploited Vulnerabilities list, added 2026-06-15.

What is the CVSS severity of CVE-2026-54420?

CVE-2026-54420 has a CVSS v3 base score of 8.5 (HIGH).

What is the EPSS score for CVE-2026-54420?

CVE-2026-54420 has an EPSS score of 1.26% (66th percentile), estimating the probability of exploitation in the next 30 days.

CVE & CISA-KEV Catalog

CVE-2026-54420

HIGHCISA KEV

8.5

CVSS v3

NVD

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.

CWE-61

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredLow

User InteractionNone

ScopeChanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

Exploit Intelligence

1.26%probability of exploitation in 30 days

66thpercentile

Moderate risk: more likely to be exploited than 66% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

Remediation due: 2026-06-18

References

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-16.