CVE-2026-112857 in Reprizo Plugin
Summary
by MITRE • 10/23/2026
Deserialization of Untrusted Data vulnerability in axiomthemes Reprizo reprizo allows Object Injection.This issue affects Reprizo: from n/a through 1.0.8.
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Analysis
by VulDB Data Team • 10/23/2026
The identified vulnerability represents a critical security flaw within the Reprizo application, specifically affecting versions ranging from initial releases up to version 1.0.8. This issue is classified as a Deserialization of Untrusted Data vulnerability, which falls under the broader category of Object Injection attacks. In software development, deserialization is the process of converting serialized data back into its original object structure in memory. While this mechanism is essential for many applications that need to persist or transmit complex state information, it becomes dangerous when applied to data sources that are not fully trusted or verified. The core technical flaw lies in the application's failure to validate and sanitize input before processing it through a deserialization routine. When an attacker provides maliciously crafted serialized objects as input, the application blindly reconstructs these objects without checking their integrity or origin. This lack of validation allows for the injection of arbitrary object types that can execute unintended code paths during their reconstruction process.
From a technical perspective, this vulnerability exploits the inherent risks associated with Java-based deserialization libraries such as Apache Commons Collections, Fastjson, or similar frameworks often used in enterprise applications like Reprizo. During the deserialization phase, if the input contains references to dangerous classes that have side effects in their constructors or readObject methods, these side effects are executed automatically by the runtime environment. This can lead to Remote Code Execution (RCE), where an attacker gains full control over the underlying server operating system. The impact is severe because it bypasses traditional authentication and authorization checks if the deserialization endpoint is accessible without strict access controls. Even if access is restricted, a compromised account with limited privileges could potentially escalate rights by manipulating serialized objects to interact with internal application components or external services in unauthorized ways.
The operational impact of this vulnerability extends beyond immediate code execution. It compromises the confidentiality, integrity, and availability of the system. Attackers can use Object Injection to exfiltrate sensitive data stored within the application's memory state, modify database records by injecting objects that trigger unintended update operations, or cause denial of service conditions through resource exhaustion attacks triggered by malicious object graphs. Furthermore, this vulnerability often serves as an initial foothold for more complex attack chains, such as Server-Side Request Forgery (SSRF) if the injected objects can make network requests to internal services, thereby expanding the blast radius within the organization's network infrastructure.
In terms of industry standards and threat modeling, this flaw aligns with CWE-502: Deserialization of Untrusted Data, which highlights the risk of executing arbitrary code during deserialization. It also maps closely to MITRE ATT&CK technique T1190: Exploit Public-Facing Application, as it leverages a vulnerability in an application exposed to users or external inputs. Additionally, depending on how the serialized data is transmitted, it may relate to CWE-20: Improper Input Validation if the root cause is insufficient checking of input parameters before processing. Understanding these mappings helps security teams prioritize remediation efforts based on established risk frameworks and common attack patterns observed in real-world scenarios.
To mitigate this vulnerability, developers must implement strict allow-listing for deserialization processes rather than relying on deny lists or generic validation rules. This involves configuring the serialization framework to only accept specific, known-safe classes that are required by the application logic. Input validation should be enforced at multiple layers, including web server configurations and application-level filters, ensuring that any data entering the system is validated against expected formats and types before it reaches the deserialization engine. Furthermore, enabling secure coding practices such as code signing for serialized objects can add an extra layer of integrity verification. For organizations using Reprizo version 1.0.8 or earlier, upgrading to a patched version where this issue has been resolved by axiomthemes is the most effective immediate remediation strategy. Until an update is available, implementing network-level controls such as Web Application Firewalls (WAFs) with rules specifically targeting suspicious serialization patterns can provide temporary protection against exploitation attempts.