CVE-2026-104474
OpenLiteSpeed before 1.9.3 Local Privilege Escalation via lsup.sh Auto-Update
litespeedtech openlitespeed
CVSS
5.4MediumExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.08%Chance of exploitation activity in the next 30 days, higher than 0% of CVEs. Scored 23 Oct 2026FIRST EPSS
What fixes it
- 1.9.3openlitespeedCVE List
A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.
Description
OpenLiteSpeed before 1.9.3 contains a local privilege escalation vulnerability in admin/misc/lsup.sh that runs unverified update packages from a nobody-writable directory as root. Attackers controlling the nobody web process can replace the package in /usr/local/lsws/autoupdate/ before extraction, so its install.sh runs as root on the next update.
Text from CVE List
Affected versions 2
- openlitespeedaffected: all versions before 1.9.3CVE List
- openlitespeedunaffected: 1.9.3CVE List
References 4
- github.com/litespeedtech/openlitespeed/commit/468523ce84388cea9ba6633c26517bc05b3e2bc1Fixvia CVE List
- openlitespeed.org/release-log/version-1-9-x/Advisoryvia CVE List
- vulncheck.com/advisories/openlitespeed-before-1.9.3-local-privilege-escalation-via-lsup-sh-auto-updateAdvisoryvia CVE List
- github.com/litespeedtech/openlitespeed/blob/v1.9.2/dist/admin/misc/lsup.sh#L538Referencevia CVE List