CVE entry · CVE-2026-54420
CVE-2026-54420: LiteSpeed cPanel Plugin UNIX Symbolic Link (Symlink) Following Vulnerability
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.
- Actively exploited: added to CISA’s KEV catalog on June 15, 2026.
- Use by ransomware: not established so far.
- Remediation deadline for US federal agencies: June 18, 2026.
Description from CISA’s KEV catalog.
What to do
- Check whether your estate includes LiteSpeed cPanel Plugin, including internet-facing devices.
- Apply the vendor’s patch or mitigations (references below). Failing that, isolate the product or stop using it, as CISA requires of US federal agencies.
- An exploited vulnerability has often been used before it was fixed: look for signs of compromise, especially on internet-facing devices.
References
- Vendor advisory or reference cited by CISA (blog.litespeedtech.com)
- NVD entry (NIST)
- CISA KEV catalog