All vulnerabilities
CVE-2026-93903

LiteSpeed Web Server (LSWS) before 6.3.7 build 1 mishandles internal redirect URL validation in a certain "corner case."

litespeedtech LiteSpeed Web ServerWeb servers
Open in ThreatlineRecord JSON
CVSS
9.4Critical
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.26%Chance of exploitation activity in the next 30 days, higher than 16% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in6.3.7 build 1Fixed versionCVE List
Published30 Sep 2026Updated 30 Sep 2026CVE List

What fixes it

  • 6.3.7 build 1LiteSpeed Web ServerCVE List

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Affected versions 1

  • LiteSpeed Web Serveraffected: all versions before 6.3.7 build 1CVE List

References 2