What’s Vulnerable › Vulnerabilities

CVE-2026-104474: OpenLiteSpeed before 1.9.3 Local Privilege Escalation via lsup.sh Auto-Update

• Severity: medium (CVSS 6.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-03 · updated 2026-10-06
• Weakness: CWE-367

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.

Affected products

• LiteSpeed Technologies OpenLiteSpeed: before 1.9.3 — fixed in 1.9.3

How to fix

Upgrade to a fixed version: LiteSpeed Technologies OpenLiteSpeed 1.9.3. Check the vendor advisory for mitigations.

References

• https://github.com/litespeedtech/openlitespeed/blob/v1.9.2/dist/admin/misc/lsup.sh#L538
• https://github.com/litespeedtech/openlitespeed/commit/468523ce84388cea9ba6633c26517bc05b3e2bc1
• https://openlitespeed.org/release-log/version-1-9-x/
• https://www.vulncheck.com/advisories/openlitespeed-before-1.9.3-local-privilege-escalation-via-lsup-sh-auto-update

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