CVE-2026-93903

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-93903
StatePUBLISHED
Assignermitre
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-30 14:17:37 UTC
Updated2026-11-05 04:17:13 UTC
DescriptionLiteSpeed 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.

Risk And Classification

Primary CVSS: v4.0 9.4 CRITICAL from [email protected]

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS: 0.002560000 probability, percentile 0.172690000 (date 2026-10-29)

Problem Types: CWE-174 | CWE-174 CWE-174 Double Decoding of the Same Data

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary9.4CRITICALCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/C...
4.0CNACVSS9.4CRITICALCVSS: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 v4.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
Low
User Interaction
None
Confidentiality
High
Integrity
High
Availability
High
Sub Conf.
High
Sub Integrity
High
Sub Availability
High

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Litespeedtech LiteSpeed Web Server affected 6.3.7 build 1 custom Not specified

References

ReferenceSourceLinkTags
docs.litespeedtech.com/lsws/changelog [email protected] docs.litespeedtech.com
www.litespeedtech.com/products/litespeed-web-server/release-log [email protected] www.litespeedtech.com
github.com/Tautvydas-Aleliunas/CVE-2026-93903 [email protected] github.com
lnkd.in/p/d2HZDcUC [email protected] lnkd.in
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