CVE-2023-0374Public exploitNetwork attack vector

Stored XSS via unescaped block CSS class

Published Apr 17, 2023 · Updated Feb 6, 2025

Stored cross-site scripting in W4 Post List before 2.4.6 allows remote authenticated users to execute script in a visitor's browser. The block renderer places the Additional CSS class(es) option into page markup without validating or escaping an injected quote and event-handler payload. A Contributor can save the payload in a post block; it runs when another user previews or views the post and moves the pointer over the block.

CVSS severity5.4
Medium
EPSS probability0.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in W4 Post List before 2.4.6 allows remote authenticated users to execute script in a visitor's browser. The block renderer places the Additional CSS class(es) option into page markup without validating or escaping an injected quote and event-handler payload. A Contributor can save the payload in a post block; it runs when another user previews or views the post and moves the pointer over the block.

The record

CVE
CVE-2023-0374
Published
Apr 17, 2023
Updated
Feb 6, 2025
Vendor
Shazzad Hossain Khan
Product
W4 Post List
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 17, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 6, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=0 <2.4.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Shazzad Hossain Khan · W4 Post Listversion=0 <2.4.6

Published CVSS scores

5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
5.4CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

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

Technologies

Your stack

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Your stack

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