Description

Unauthenticated PHP Object Injection in Abogado <= 1.18 versions.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "9.8",
  "pubDate": "2026-08-06T15:17:18.940Z",
  "pubdate": "2026-08-06T15:17:18.940Z",
  "executiveSummary": "An unauthenticated PHP Object Injection vulnerability has been identified in Abogado versions <= 1.18. This security flaw enables remote, unauthenticated attackers to supply maliciously crafted serialized data to vulnerable application entry points, leading to severe security implications including potential remote code execution, arbitrary file manipulation, or denial of service depending on the available gadget chains within the application's object scope. The vulnerability stems from insecure deserialization practices where user-supplied input is processed by native PHP unserialization functions without adequate validation or sanitization. Given the unauthenticated nature of the flaw, external threat actors with network access to the target system can exploit this weakness without requiring prior credentials or interaction from privileged users. The risk profile is critical, as successful exploitation compromises the integrity and confidentiality of the underlying host environment. Remediation requires updating the application beyond version 1.18 or applying strict input validation and secure deserialization wrappers where applicable.",
  "technicalDetails": "The vulnerability resides in the core handling of user-supplied data within Abogado versions <= 1.18, specifically where serialized PHP objects are processed via vulnerable functions such as unserialize(). PHP Object Injection occurs when untrusted input is passed into the unserialize() function without proper sanitization or cryptographic verification. Because PHP allows classes to implement magic methods such as __wakeup() and __destruct(), an attacker can manipulate the serialized payload to invoke these methods automatically upon object instantiation or destruction. This mechanism allows the attacker to hijack the application control flow.\nThe attack flow proceeds as follows: First, the unauthenticated attacker identifies a vulnerable script or endpoint within the application that accepts serialized parameters via HTTP GET, POST, or cookies without validation. Second, the attacker crafts a malicious serialized payload containing specific class definitions and properties designed to leverage existing application classes or included library classes acting as exploitation gadgets. Third, the attacker transmits this payload to the target application over the network. Fourth, the application reads the input and passes it directly to the unserialize() function. Fifth, PHP reconstitutes the object graph based on the malicious stream, triggering unintended method executions defined within the gadget chain. Finally, depending on the assembled gadget chain, the payload executes arbitrary code within the context of the web server process, leading to full system compromise, data exfiltration, or lateral movement."
}