CVE-2024-3239Public exploitNetwork attack vector

Stored XSS via unescaped headingURL block option

Published May 13, 2024 · Updated Nov 1, 2024

Stored XSS in WPXPO PostX before 4.0.2 allows remote authenticated users to execute script in visitors' browsers through a crafted block. The Ultimate Post Heading block writes the attacker-controlled headingURL option into page output without validating or escaping the attribute value. Contributor access is required to store the payload, and a visitor must view the post and hover over its heading to trigger script execution.

CVSS severity5.4
Medium
EPSS probability0.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in WPXPO PostX before 4.0.2 allows remote authenticated users to execute script in visitors' browsers through a crafted block. The Ultimate Post Heading block writes the attacker-controlled headingURL option into page output without validating or escaping the attribute value. Contributor access is required to store the payload, and a visitor must view the post and hover over its heading to trigger script execution.

The record

CVE
CVE-2024-3239
Published
May 13, 2024
Updated
Nov 1, 2024
Vendor
WPXPO
Product
PostX
Classifications
CWE-79, CAPEC-592, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 13, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 1, 2024Record 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 <4.0.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

WPXPO · PostXversion=0 <4.0.2

Published CVSS scores

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 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')
CAPEC-592Stored XSS
T1059.007JavaScript/JScript

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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