CVE-2026-12112 Red Hat CVE debrief

Who should care

Administrators and users of the foreman-mcp-server are advised to take immediate action to mitigate this vulnerability. This vulnerability can be exploited by unauthenticated attackers, which makes it a critical issue to address. Red Hat has provided references and errata related to this CVE.

Technical summary

The vulnerability is caused by the improper caching of authenticated client connections in the MCP Server, which allows unauthenticated attackers to hijack active administrative sessions. The issue arises from trusting a non-secret session ID without re-validating authentication tokens and logging all newly created session IDs to standard logs. This can lead to privilege escalation and infrastructure-wide code execution. The CVSS vector for this vulnerability is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Defensive priority

High priority should be given to patching and mitigating this vulnerability due to its high CVSS score and potential for exploitation. Administrators should review and apply the provided patches and errata from Red Hat.

Recommended defensive actions

• Apply patches and errata provided by Red Hat to fix the session management vulnerability.
• Review and update the MCP Server configuration to ensure proper caching of authenticated client connections.
• Implement additional security measures to prevent session hijacking, such as re-validating authentication tokens.
• Monitor logs for newly created session IDs and restrict access to sensitive information.
• Consider implementing compensating controls, such as Web Application Firewalls (WAFs), to detect and prevent exploitation attempts.

Evidence notes

The CVE-2026-12112 record was obtained from the NVD database, which provides detailed information about the vulnerability, including its CVSS score, vector, and references. Red Hat has provided errata and references related to this CVE, which can be used to mitigate the vulnerability.

Official resources