CVE-2026-78286 in Geo Controller Plugin
Summary
by MITRE • 08/27/2026
Unauthenticated PHP Object Injection in Geo Controller <= 8.9.8 versions.
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Analysis
by VulDB Data Team • 08/27/2026
The vulnerability identified as an unauthenticated PHP object injection within the Geo Controller component of versions up to and including 8.9.8 represents a critical security flaw rooted in improper deserialization practices. This type of vulnerability occurs when user-supplied input is passed directly into a function that reconstructs objects from serialized data without adequate validation or sanitization. In this specific context, the lack of authentication required for exploitation means that any remote attacker can interact with the vulnerable endpoint to trigger the injection sequence. The core technical flaw lies in the application's failure to verify the integrity and origin of the serialized object before processing it, allowing an adversary to craft a malicious payload containing arbitrary PHP objects rather than legitimate data structures.
From a technical perspective, this vulnerability aligns closely with CWE-502, which describes Deserialization of Untrusted Data. The attacker exploits the application's trust in its own internal serialization mechanisms by injecting a serialized string that instantiates classes available within the application or included libraries. Once these objects are instantiated, they may execute their magic methods such as __wakeup(), __destruct(), or __toString() during the deserialization process. If the class definitions include logic for file operations, database queries, or system command execution, the attacker can leverage this to achieve arbitrary code execution on the server hosting the application. This bypasses traditional input validation checks because the attack vector targets the object instantiation phase rather than direct string manipulation of form fields or URL parameters.
The operational impact of this vulnerability is severe due to its unauthenticated nature and potential for remote code execution. An attacker can compromise the confidentiality, integrity, and availability of the affected system without needing valid credentials. By chaining multiple gadget classes available in the PHP environment, often referred to as a Gadget Chain, an attacker can escalate from simple object injection to full control over the underlying operating system. This could lead to data exfiltration, installation of web shells for persistent access, lateral movement within the network, or complete denial of service by crashing the application process. The presence in the Geo Controller suggests that this functionality might be exposed via public-facing APIs or endpoints related to geolocation services, increasing the attack surface significantly.
This vulnerability maps directly to MITRE ATT&CK technique T1059, specifically Command and Scripting Interpreter sub-techniques if code execution is achieved, as well as T1078 for Valid Accounts if credential theft occurs during exploitation. It also relates to CWE-20 Improper Input Validation regarding the failure to restrict deserialization inputs. To mitigate this risk, immediate action must be taken by upgrading the Geo Controller component to a version greater than 8.9.8 where the vulnerability has been patched. In scenarios where an upgrade is not immediately feasible, implementing strict allowlists for serialized classes can prevent arbitrary object instantiation. Additionally, enabling PHP's built-in serialization filters and ensuring that magic methods are either removed or strictly validated can reduce the effectiveness of gadget chains. Network-level controls such as Web Application Firewalls may also help detect anomalous POST requests containing suspicious serialized payloads, although this is not a substitute for patching the underlying code flaw.