CVE-2023-40000Known exploitationNetwork attack vector

Stored XSS via unescaped CDN status notices

Published Apr 16, 2024 · Updated Apr 28, 2026

Stored XSS in LiteSpeed Cache for WordPress 5.7 and earlier allows remote attackers to run scripts in administrators' browsers. The litespeed/v1/cdn_status REST route accepts any caller because is_from_cloud returns true, and update_cdn_status stores unescaped _msg or nameservers input in an admin notice. The default installation is exposed; an administrator or other wp-admin user must view a back-end page, where the script runs in that user's browser context and can support account takeover.

CVSS severity8.3
High
EPSS probability54.87%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Stored XSS in LiteSpeed Cache for WordPress 5.7 and earlier allows remote attackers to run scripts in administrators' browsers. The litespeed/v1/cdn_status REST route accepts any caller because is_from_cloud returns true, and update_cdn_status stores unescaped _msg or nameservers input in an admin notice. The default installation is exposed; an administrator or other wp-admin user must view a back-end page, where the script runs in that user's browser context and can support account takeover.

The record

CVE
CVE-2023-40000
Published
Apr 16, 2024
Updated
Apr 28, 2026
Vendor
LiteSpeed Technologies
Product
LiteSpeed Cache for WordPress
Classifications
CWE-79, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 16, 2024CVE publishedPublication date reported by the CVE source.
  2. Apr 28, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=5.7
  2. Affected versionversion=n/a <=5.7 changes=[{"at":"5.7.0.1","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

LiteSpeed Technologies · LiteSpeed Cache for WordPressversion=0 <=5.7; version=n/a <=5.7 changes=[{"at":"5.7.0.1","status":"unaffected"}]

Published CVSS scores

8.3PatchstackCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L
6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationReported
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo