CVE-2025-12937Network attack vector

Unauthenticated custom-field modification via unchecked AJAX handler

Published Nov 18, 2025 · Updated Nov 18, 2025

Missing authorization in ACF Flexible Layouts Manager 1.1.6 and earlier allows remote attackers to modify custom fields on posts and pages. The acf_flm_update_template_with_pasted_layout AJAX handler accepts a pasted layout and updates fields without checking a WordPress capability. No authentication is required, and the reported consequence is modification of custom-field values on individual posts and pages.

CVSS severity6.5
Medium
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in ACF Flexible Layouts Manager 1.1.6 and earlier allows remote attackers to modify custom fields on posts and pages. The acf_flm_update_template_with_pasted_layout AJAX handler accepts a pasted layout and updates fields without checking a WordPress capability. No authentication is required, and the reported consequence is modification of custom-field values on individual posts and pages.

The record

CVE
CVE-2025-12937
Published
Nov 18, 2025
Updated
Nov 18, 2025
Vendor
valentinpellegrin
Product
ACF Flexible Layouts Manager
Classifications
CWE-862, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 18, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 18, 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=* <=1.1.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

valentinpellegrin · ACF Flexible Layouts Managerversion=* <=1.1.6

Published CVSS scores

6.5WordfenceCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/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.

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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-862Missing Authorization
T1190Exploit Public-Facing Application

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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