Authenticated object injection via unsafe import deserialization
Published Nov 21, 2022 · Updated Apr 8, 2026
PHP object injection in Muffin Group BeTheme 26.5.1.4 and earlier allows remote authenticated users to inject objects through import requests. The mfn_builder_import, mfn_builder_import_page, importdata, importsinglepage, and importfromclipboard AJAX handlers deserialize attacker-controlled import parameters. Subscriber-level access reaches these handlers; a usable POP chain turns the injection into code execution, sensitive-data access, or file deletion.
Summary
What happened
PHP object injection in Muffin Group BeTheme 26.5.1.4 and earlier allows remote authenticated users to inject objects through import requests. The mfn_builder_import, mfn_builder_import_page, importdata, importsinglepage, and importfromclipboard AJAX handlers deserialize attacker-controlled import parameters. Subscriber-level access reaches these handlers; a usable POP chain turns the injection into code execution, sensitive-data access, or file deletion.
The record
- CVE
- CVE-2022-3861
- Published
- Nov 21, 2022
- Updated
- Apr 8, 2026
- Vendor
- Muffin Group
- Product
- BeTheme
- Classifications
- CWE-502, T1190
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Nov 21, 2022CVE publishedPublication date reported by the CVE source.
- 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.
- Affected versionversion=0 <=26.5.1.4
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Weakness, pattern, technique
Public exploit references
- RCE Security authenticated AJAX proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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