CVE-2026-54420: listed in the CISA KEV catalog

CVE-2026-54420 · CVSS 8.5 HIGH · EPSS 1% · KEV 2026-06-15 · patch available

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.

Is CVE-2026-54420 exploited?

• Listed in the CISA KEV catalog on 2026-06-15.
• Federal remediation due 2026-06-18.
• Past that date by 134 days.
• EPSS puts exploitation in the next 30 days at 1%.
• Public exploit code: none found in monitored sources.

Which products and versions are affected?

• LiteSpeed Technologies · cPanel Plugin · >= 2.3, < 2.4.8
• litespeedtech · litespeed cpanel plugin · < 2.4.8
• litespeedtech · litespeed whm plugin · < 5.3.2.0

Is there a patch?

Yes. Update to one of these or later:

From LiteSpeed Technologies's CVE record · LiteSpeed Technologies advisory

From NVD's analysis

What PlainSec published about CVE-2026-54420

• Exploited Joomla and LiteSpeed bugs leave backdoors behind (2026-05-14)

Primary sources

• NVD record
• CISA KEV catalog
• LiteSpeed Technologies advisory

KEV and EPSS are re-checked daily. Record last updated 2026-10-25.