cPanel Security advisory (14 September 2026) warns of a critical privilege-escalation flaw in LiteSpeed Web Server Enterprise: on shared-hosting servers a malicious low-privilege website user could gain root-level access, bypassing account isolation including CageFS, and access or alter other sites and the server. Affected: LiteSpeed Web Server Enterprise prior to v6.3.7.

Fix: upgrade to 6.3.7 or later. cPanel/LiteSpeed publish the forced update command /usr/local/lsws/admin/misc/lsup.sh -f -v 6.3.7. LiteSpeed store announcement for 6.3.7 (11 September 2026) lists three security changes (lscgid auth, internal redirect URL validation, block internal-use env vars from .htaccess) without naming a CVE or privilege-escalation root cause; neither cPanel nor LiteSpeed assigned a public CVE or CVSS for this Enterprise web-server issue as of 15 September 2026 check.

Advisory does not state in-the-wild exploitation for this Enterprise flaw (distinct from earlier actively exploited LiteSpeed cPanel-plugin issues CVE-2026-48172 and CVE-2026-54420 already on Cyberstack).

OpenLiteSpeed not named in the cPanel advisory. (sources: cPanel; LiteSpeed 6.3.7 announcement)

Correction (02 Nov 2026): removed The Hacker News as a source; removed details no other source gives. (source: cPanel; LiteSpeed)