CVE-2026-12544 in Foreman
Summary
by MITRE • 10/01/2026
A flaw was found in Foreman. The foreman-rake initialization logic in /usr/share/foreman/config/settings.rb contains a vulnerable code pattern where configuration data is processed through two distinct executable layers. This creates a multi-stage execution chain that allows for both Server-Side Template Injection (SSTI) and insecure deserialization. This vulnerability can lead to remote code execution, total infrastructure compromise and supply chain risk.
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Analysis
by VulDB Data Team • 10/01/2026
The identified vulnerability in Foreman stems from a critical architectural flaw within the initialization logic located in the /usr/share/foreman/config/settings.rb file. This component is responsible for processing configuration data during the application startup sequence, but it employs a multi-stage execution pattern that introduces significant security risks. Specifically, the code processes configuration inputs through two distinct executable layers without adequate sanitization or type checking between stages. This design choice creates an attack surface where maliciously crafted input can traverse these layers and be interpreted as executable code rather than static data. The core technical flaw lies in the lack of strict validation on how configuration parameters are deserialized and subsequently rendered, allowing attackers to inject payloads that exploit both Server-Side Template Injection (SSTI) mechanisms and insecure deserialization vulnerabilities simultaneously.
From a technical perspective, this multi-stage execution chain allows an attacker to bypass initial input filters by splitting malicious logic across the two processing layers. The first layer may accept seemingly benign configuration data, while the second layer interprets specific patterns within that data as template directives or object instantiation commands. This dual-vector approach significantly lowers the barrier for exploitation because it does not rely on a single point of failure but rather exploits the complex interaction between different parts of the initialization process. When an attacker successfully injects code through this pathway, they can achieve remote code execution with the privileges of the Foreman service account. In many deployment scenarios, these services run with elevated permissions to manage infrastructure components, meaning successful exploitation grants the adversary immediate control over the underlying operating system and potentially other connected systems within the managed environment.
The operational impact of this vulnerability is severe, extending beyond simple application compromise to encompass total infrastructure risk. Remote code execution in a management platform like Foreman provides attackers with persistent access to critical IT operations data. This includes inventory details, network configurations, user credentials stored for automated tasks, and integration keys for other systems such as Puppet or Ansible. Furthermore, the presence of supply chain risks implies that an attacker could modify deployment scripts or configuration templates pushed out to managed nodes, effectively turning a single compromised server into a vector for widespread compromise across the entire fleet. This aligns with high-severity threat models where initial access leads directly to privilege escalation and lateral movement capabilities within enterprise networks.
In terms of industry standard classifications, this vulnerability maps closely to CWE-94 Improper Control of Generation of Code (Code Injection) due to the SSTI aspect, as well as CWE-502 Deserialization of Untrusted Data for the insecure deserialization component. The exploitation technique also correlates with MITRE ATT&CK techniques such as T1059 Command and Scripting Interpreter through template injection and T1648 Supply Chain Compromise if the vulnerability is leveraged to alter automated deployment processes. Defense-in-depth strategies are essential here, but immediate mitigation requires patching the Foreman installation to a version where this initialization logic has been refactored to enforce strict type checking and prevent arbitrary code execution during configuration processing. Organizations should also audit their current deployments for any signs of unauthorized access or anomalous behavior in log files related to settings.rb or template rendering engines, as these may indicate active exploitation attempts against unpatched systems.