Description

Unauthenticated PHP Object Injection in Abelle <= 1.22 versions.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "9.8",
  "pubDate": "2026-08-06T15:17:18.813Z",
  "pubdate": "2026-08-06T15:17:18.813Z",
  "executiveSummary": "An unauthenticated PHP Object Injection vulnerability has been identified in Abelle versions <= 1.22. This security flaw arises from the insecure handling and deserialization of untrusted user input within the application code.\nSuccessful exploitation of this vulnerability allows remote, unauthenticated attackers to manipulate serialized data streams processed by the application. Depending on the availability of compatible gadget chains within the application scope, this can lead to severe security implications, including potential remote code execution, arbitrary file manipulation, or denial of service.\nThe affected product comprises all Abelle versions up to and including 1.22. The risk profile is critical due to the lack of authentication requirements, enabling arbitrary external entities to interact with vulnerable deserialization routines exposed over the network.\nExploitation prerequisites include network connectivity to the vulnerable endpoint handling the insecure deserialization without requiring prior authentication credentials or specific privilege levels.",
  "technicalDetails": "The root cause of the vulnerability stems from the utilization of insecure deserialization functions, specifically native PHP object instantiation mechanisms such as unserialize(), processing user-supplied input without proper validation or sanitization.\nThe vulnerability resides within the request handling components of Abelle <= 1.22, where input parameters received via HTTP requests are directly passed into deserialization routines. Because the input lacks cryptographic integrity checks or strict type validation, an attacker can supply a specially crafted serialized payload containing malicious object structures.\nThe attack flow proceeds as follows: First, the attacker identifies a network-exposed entry point in Abelle that accepts serialized data. Second, the attacker crafts a malicious payload incorporating serialized objects designed to leverage existing application or third-party library classes acting as gadget chains. Third, the attacker transmits this payload via an unauthenticated HTTP request to the vulnerable component. Finally, upon deserialization, PHP automatically triggers magic methods (such as __destruct() or __wakeup()) defined within the gadget chain classes, executing the attacker-controlled logic.\nAuthentication requirements are nonexistent, as the vulnerable endpoint is accessible to unauthenticated remote adversaries over the network. Privilege requirements are similarly absent, requiring no pre-existing user accounts or administrative roles.\nPost-exploitation impact is dictated by the specific gadget chains present within the application classpath. In the presence of viable execution chains, attackers can achieve full remote code execution under the security context of the web server process, potentially leading to complete system compromise, data exfiltration, or lateral movement within the network infrastructure."
}