Vulnerability · Published Sep 30, 2026 · Assigned by mitre
CVE-2026-93903
Critical 9.4
In plain English
A critical-severity security flaw in LiteSpeed Web Server from litespeedtech. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 29% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code.
Severity (CVSS 4.0)9.4Critical
Exploit odds (30 days)0.4%top 71.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack tooling1Public PoC
Official description
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| litespeedtech | LiteSpeed Web Server | 0 – before 6.3.7 build 1 |
Weakness: CWE-174 · Vector: 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