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Known exploited vulnerability

CVE-2026-54420

highCVSS 3.1 8.5In CISA KEVEPSS 1.4%Published · LiteSpeed Technologies

The short answer

CVE-2026-54420 affects LiteSpeed Technologies cPanel Plugin and is rated high (CVSS 8.5). CISA added it to the Known Exploited Vulnerabilities catalog on 2026-06-15: attackers are using it, so patch it first.

What it is

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.

Weakness: CWE-61.

Severity

8.5 high

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

Exploited (CISA KEV)

Yes, since Jun 15, 2026

Federal due date Jun 18, 2026

EPSS, next 30 days

1.4%

Higher than 73% of scored CVEs

How it can be exploited

Attack vector
Network
Attack complexity
High
Privileges required
Low
User interaction
None
Scope
Changed
Confidentiality impact
High
Integrity impact
High
Availability impact
High

What CISA says to do

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…

Affected products

cPanel Plugin. NVD's record lists the exact affected versions.

References

Questions

Is CVE-2026-54420 being exploited?

Yes. CISA added CVE-2026-54420 to its Known Exploited Vulnerabilities catalog on 2026-06-15, with a federal remediation due date of 2026-06-18.

How do I fix CVE-2026-54420?

CISA's 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…

From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.

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