CVE-2024-45429Network attack vector

Stored XSS via unescaped field labels

Published Sep 4, 2024 · Updated Mar 25, 2025

Stored XSS in WP Engine Advanced Custom Fields and Advanced Custom Fields PRO 6.3.5 and earlier allows remote authenticated users to execute scripts. The Field Group editor renders attacker-controlled field labels without correct output escaping, allowing stored markup to execute in a viewer's browser. The attacker needs the configured capability-setting privilege, and a logged-in user with the same privilege must view the poisoned field group.

CVSS severity6.1
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 WP Engine Advanced Custom Fields and Advanced Custom Fields PRO 6.3.5 and earlier allows remote authenticated users to execute scripts. The Field Group editor renders attacker-controlled field labels without correct output escaping, allowing stored markup to execute in a viewer's browser. The attacker needs the configured capability-setting privilege, and a logged-in user with the same privilege must view the poisoned field group.

The record

CVE
CVE-2024-45429
Published
Sep 4, 2024
Updated
Mar 25, 2025
Vendor
WP Engine
Product
Advanced Custom Fields
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 4, 2024CVE publishedPublication date reported by the CVE source.
  2. Mar 25, 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=6.3.5 and earlier

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

WP Engine · Advanced Custom Fieldsversion=6.3.5 and earlier
WP Engine · Advanced Custom Fields PROversion=6.3.5 and earlier

Published CVSS scores

6.1NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
6.1CISA ADPCVSS: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
Privilegesauthenticated
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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