Vulnerability record/PUBLISHED/Published Sep 30, 2026 13:44:11 UTC

CVE-2026-93903

LiteSpeed Web Server (LSWS) before 6.3.7 build 1 mishandles internal redirect URL validation in a certain "corner case" of %252e%252e double decoding, letting a low-privileged tenant execute code in the context of a different account.

Base score9.4/ 10

SeverityCriticalCVSS 4.0

Exploitability / impact

CVSS metric breakdown

Vector-derived attributes

Base severityCritical

Attack vectorNetworkAV

Attack complexityLowAC

Attack requirementsNoneAT

Privileges requiredLowPR

User interactionNoneUI

Vulnerable system confidentialityHighVC

Vulnerable system integrityHighVI

Vulnerable system availabilityHighVA

Subsequent system confidentialityHighSC

Subsequent system integrityHighSI

Subsequent system availabilityHighSA

CVSS vector stringCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

CVSS communicates standardized severity and impact characteristics. It does not establish whether a system is exploitable in your specific environment.

Record context

CVE Numbering Authoritymitre

Last updatedNov 5, 2026 03:15:00 UTC

PublishedSep 30, 2026 13:44:11 UTC

ReservedSep 18, 2026 20:40:05 UTC