CVE-2024-9204Network attack vector

Reflected XSS via unescaped request URI

Published Oct 4, 2024 · Updated Apr 8, 2026

Reflected XSS in NerdPress Smart Custom 404 Error Page 11.4.7 and earlier allows remote attackers to execute scripts through a crafted URL. The pp_404_get_the_url function passes the request URI to the URL-causing-404 block and pp_404_url shortcode without sufficient sanitization or output escaping. Execution requires a visitor to follow an attacker-crafted link, after which the script runs in that visitor's browser context.

CVSS severity6.1
Medium
EPSS probability0.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in NerdPress Smart Custom 404 Error Page 11.4.7 and earlier allows remote attackers to execute scripts through a crafted URL. The pp_404_get_the_url function passes the request URI to the URL-causing-404 block and pp_404_url shortcode without sufficient sanitization or output escaping. Execution requires a visitor to follow an attacker-crafted link, after which the script runs in that visitor's browser context.

The record

CVE
CVE-2024-9204
Published
Oct 4, 2024
Updated
Apr 8, 2026
Vendor
NerdPress
Product
Smart Custom 404 Error Page
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 4, 2024CVE publishedPublication date reported by the CVE source.
  2. Apr 8, 2026Record 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 <=11.4.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

NerdPress · Smart Custom 404 Error Pageversion=0 <=11.4.7

Published CVSS scores

6.1WordfenceCVSS: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 exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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