CVE-2025-54940Network attack vector

Admin-page tampering via unescaped post titles

Published Aug 8, 2025 · Updated Aug 8, 2025

HTML injection in WP Engine Advanced Custom Fields before 6.4.3 allows remote authenticated users to alter admin-page display. The affected ACF admin code outputs attacker-controlled post titles without HTML escaping, allowing crafted markup to render. Exploitation requires an ACF administrator to save malicious HTML and another user to view the affected admin interface; reported impact is limited to page-content tampering.

CVSS severity4.6
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

HTML injection in WP Engine Advanced Custom Fields before 6.4.3 allows remote authenticated users to alter admin-page display. The affected ACF admin code outputs attacker-controlled post titles without HTML escaping, allowing crafted markup to render. Exploitation requires an ACF administrator to save malicious HTML and another user to view the affected admin interface; reported impact is limited to page-content tampering.

The record

CVE
CVE-2025-54940
Published
Aug 8, 2025
Updated
Aug 8, 2025
Vendor
WP Engine
Product
Advanced Custom Fields
Classifications
CWE-94, T1189
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Aug 8, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 8, 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=prior to 6.4.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

WP Engine · Advanced Custom Fieldsversion=prior to 6.4.3

Published CVSS scores

4.6JPCERT/CCCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:A/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N
3.4JPCERT/CCCVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:C/C:N/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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-94Code injection
T1189Drive-by Compromise

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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