EUVD-2026-52180
GHSA-5953-j744-chvm
Severity by source
AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:L
Admin access (PR:H) and gadget chain dependency (AC:H) constrain exploitation, but successful deserialization achieves full RCE warranting C:H/I:H/A:H.
Primary rating from Vendor (WPScan).
CVSS VectorVendor: WPScan
Lifecycle Timeline
5DescriptionCVE.org
The Clearfy Cache WordPress plugin before 2.4.3 does not restrict the classes allowed when unserializing settings-import data, allowing users with administrator access to perform PHP Object Injection attacks, which may lead to remote code execution when a suitable gadget chain is present in the environment.
AnalysisAI
PHP Object Injection in Clearfy Cache WordPress plugin (versions before 2.4.3) exposes administrator-authenticated users to potential remote code execution through unrestricted deserialization during settings import. The plugin's import handler passes attacker-controlled serialized data to PHP's unserialize() without class whitelisting, enabling object injection. A publicly available POC exists via WPScan, though RCE is conditional on a suitable gadget chain being present in the WordPress environment; EPSS is low (0.21%, 12th percentile) and no CISA KEV listing has been issued, indicating no confirmed widespread exploitation.
Technical ContextAI
This vulnerability exploits CWE-502 (Deserialization of Untrusted Data) in the Clearfy Cache plugin (CPE: cpe:2.3:a:unknown:clearfy_cache:*:*:*:*:*:*:*:*). The plugin's settings-import functionality calls PHP's native unserialize() on user-supplied data without restricting which classes may be instantiated during deserialization. PHP object injection occurs when attacker-controlled serialized payloads cause the runtime to instantiate arbitrary PHP objects whose magic methods (__wakeup, __destruct, __toString, etc.) are invoked automatically. RCE depends on a 'gadget chain' - a sequence of such method calls across classes already loaded in the PHP process (from WordPress core, co-installed plugins, or PHP libraries like Monolog or Guzzle) that together produce arbitrary code execution. The attack surface is the WordPress admin settings-import endpoint.
RemediationAI
Upgrade Clearfy Cache to version 2.4.3 or later, which restricts the classes allowed during settings-import deserialization; the vendor patch is confirmed available per WPScan (https://wpscan.com/vulnerability/3daf62cd-eefe-49ec-89f7-b13f88111853/). If immediate patching is not feasible, restrict WordPress administrator access strictly to trusted individuals and audit who holds admin credentials, as exploitation requires admin-level authentication. As an additional compensating control, consider disabling or blocking access to the plugin's settings-import feature at the WAF or application level - note this may prevent legitimate settings migration. Sites with large plugin or theme ecosystems should prioritize patching, as gadget chain availability increases with the number of installed components. There is no indication of a workaround that eliminates the vulnerability without patching.
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External POC / Exploit Code
Leaving vuln.today