Exploited vulnerability · CISA KEV

Is CVE-2026-54420 exploited? Yes: in CISA KEV since 15 Jun 2026

Gociux · LiteSpeed cPanel Plugin · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2026-54420, LiteSpeed cPanel Plugin UNIX Symbolic Link (Symlink) Following Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 15 Jun 2026, 1 days after it was published. It affects LiteSpeed cPanel Plugin. If you run it, CISA's required action is: 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.

What it is

LiteSpeed cPanel plugin contains a UNIX symbolic link (Symlink) following vulnerability that could allow a user with FTP or web shell access on a shared hosting server running CloudLinux/CageFS.

What to do

1. Check whether you run it. Look for cPanel Plugin in your asset inventory, including appliances and cloud images. Stack check lists every exploited LiteSpeed CVE at once.
2. Apply the fix. 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.
3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 14 Jun 2026.
4. Get told next time. Email alerts when CISA adds a CVE for LiteSpeed.

Other exploited CVEs in cPanel Plugin

• CVE-2026-48172: LiteSpeed cPanel Plugin Privilege Escalation Vulnerability (26 May 2026)

References

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

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in June 2026 · LiteSpeed scorecard · act-now radar.