CVE-2024-33641Network attack vector

Authenticated PHP object injection via custom fields

Published Apr 29, 2024 · Updated Apr 28, 2026

PHP object injection in Yoast Custom Field Finder 0.3 and earlier allows remote authenticated users to instantiate objects via custom fields. Published advisories identify unsafe deserialization during custom-field processing but do not disclose the responsible function or input path. Author-level access and a suitable PHP POP chain are required; without that chain, no site takeover or service interruption is reported.

CVSS severity5.4
Medium
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

PHP object injection in Yoast Custom Field Finder 0.3 and earlier allows remote authenticated users to instantiate objects via custom fields. Published advisories identify unsafe deserialization during custom-field processing but do not disclose the responsible function or input path. Author-level access and a suitable PHP POP chain are required; without that chain, no site takeover or service interruption is reported.

The record

CVE
CVE-2024-33641
Published
Apr 29, 2024
Updated
Apr 28, 2026
Vendor
Yoast
Product
Custom Field Finder
Classifications
CWE-502
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 29, 2024CVE publishedPublication date reported by the CVE source.
  2. Apr 28, 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=n/a <=0.3 changes=[{"at":"0.4","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Yoast · Custom Field Finderversion=n/a <=0.3 changes=[{"at":"0.4","status":"unaffected"}]

Published CVSS scores

5.4PatchstackCVSS:3.1/AV:N/AC:H/PR:N/UI:N/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.

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data

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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