CVE-2024-0509Network attack vector

Script execution via unescaped request parameter

Published Feb 5, 2024 · Updated Apr 8, 2026

Reflected XSS in WP 404 Auto Redirect to Similar Post 1.0.3 and earlier allows remote attackers to run scripts via request. The AJAX preview path returns the request value in its response without the input sanitization and output escaping added by the security patch. Exploitation requires no account but requires a victim to follow a crafted link, placing the injected code in the site's browser context.

CVSS severity6.1
Medium
EPSS probability1.22%
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 WP 404 Auto Redirect to Similar Post 1.0.3 and earlier allows remote attackers to run scripts via request. The AJAX preview path returns the request value in its response without the input sanitization and output escaping added by the security patch. Exploitation requires no account but requires a victim to follow a crafted link, placing the injected code in the site's browser context.

The record

CVE
CVE-2024-0509
Published
Feb 5, 2024
Updated
Apr 8, 2026
Vendor
Konrad Chmielewski
Product
WP 404 Auto Redirect to Similar Post
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 5, 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 <=1.0.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Konrad Chmielewski · WP 404 Auto Redirect to Similar Postversion=0 <=1.0.3

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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.

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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