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Ajax Search Lite CVE-2026-16258

| EUVDEUVD-2026-54389 CRITICAL
Deserialization of Untrusted Data (CWE-502)
2026-08-07 WPScan GHSA-m7vw-4232-p79x
9.8
CVSS 3.1 · Vendor: WPScan
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Severity by source

Vendor (WPScan) PRIMARY
9.8 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
vuln.today AI
8.1 HIGH

Unauthenticated network reach and no user interaction, but full RCE requires a suitable POP gadget chain to be present, warranting AC:H; impact is total when achieved.

3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
4.0 AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (WPScan).

CVSS VectorVendor: WPScan

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

4
Analysis Generated
Aug 07, 2026 - 19:26 vuln.today
Patch available
Aug 07, 2026 - 07:01 EUVD
CVE Published
Aug 07, 2026 - 06:00 cve.org
CRITICAL 9.8
CVE Published
Aug 07, 2026 - 06:00 cve.org
UNKNOWN (no severity yet)

DescriptionCVE.org

The Ajax Search Lite WordPress plugin before 4.14.5 does not prevent the deserialization of untrusted input, allowing unauthenticated attackers to perform PHP Object Injection. When a suitable POP chain is present via another installed Ajax Search Lite WordPress plugin before 4.14.5 or , this can be leveraged to achieve Remote Code Execution.

AnalysisAI

PHP Object Injection in the Ajax Search Lite WordPress plugin before 4.14.5 lets unauthenticated remote attackers pass untrusted serialized data into a PHP unserialize() sink, and where a suitable POP gadget chain exists in a co-installed plugin or theme, this escalates to remote code execution. Reported by WPScan with publicly available exploit code, it carries a CVSS 9.8 rating but a low EPSS of 0.22% (13th percentile), and is not listed in CISA KEV. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Identify WordPress site with Ajax Search Lite <4.14.5
Delivery
Send crafted request with serialized PHP object
Exploit
Plugin unserializes untrusted input
Execution
Trigger POP gadget chain in loaded code
Persist
Execute arbitrary PHP code
Impact
Deploy webshell or take over site

Vulnerability AssessmentAI

Exploitation Exploitation requires reaching the Ajax Search Lite (pre-4.14.5) unauthenticated AJAX search request handler that deserializes attacker input - no login is needed (PR:N). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment Signals are mixed and warrant nuanced prioritization. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker sends a crafted HTTP request to the plugin's unauthenticated AJAX search handler containing a serialized PHP object payload. The plugin unserializes it, instantiating attacker-controlled objects; if a POP gadget chain from Ajax Search Lite, WordPress core, or another installed plugin is triggered, the chain executes attacker logic and can lead to remote code execution or webshell deployment. …
Remediation Vendor-released patch: upgrade Ajax Search Lite to version 4.14.5 or later, which addresses the unsafe deserialization; this is the primary and confirmed fix (advisory: https://wpscan.com/vulnerability/8487a2ce-cb4d-46b8-942e-334ac94cf115/). … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours, immediately upgrade Ajax Search Lite to version 4.14.5 or later on all affected WordPress installations and verify successful deployment in production environments. …

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Threat intelligence, references, and detailed analysis are available after sign-in.

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CVE-2026-16258 vulnerability details – vuln.today

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