CVE-2026-17432 in hermes-agent
Summary
by MITRE • 07/26/2026
A vulnerability was detected in NousResearch hermes-agent 2026.6.5. Affected by this vulnerability is an unknown functionality of the file hermes-agent/plugins/platforms/simplex/adapter.py of the component SimpleX Gateway Authorization. The manipulation of the argument contactId results in improper access controls. The attack may be launched remotely. A high complexity level is associated with this attack. The exploitation appears to be difficult. The exploit is now public and may be used. The patch is identified as 490c486ff65b766d9de0fe0e6f26e1778aaa8fb3. Applying a patch is advised to resolve this issue.
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Analysis
by VulDB Data Team • 07/26/2026
This vulnerability in NousResearch hermes-agent version 2026.6.5 represents a critical access control flaw within the SimpleX Gateway Authorization component. The issue manifests through the manipulation of the contactId argument in the adapter.py file located at hermes-agent/plugins/platforms/simplex/adapter.py. This weakness allows unauthorized users to bypass normal authorization checks and potentially gain inappropriate access to system resources or data. The vulnerability's remote exploitation capability significantly increases its threat surface, as attackers can leverage this flaw from external networks without requiring physical access to the target system.
The technical implementation of this vulnerability stems from inadequate input validation and authentication controls within the SimpleX Gateway Authorization functionality. When the contactId parameter is manipulated, the system fails to properly verify the identity or permissions of the requesting entity, creating a path for privilege escalation or unauthorized data access. This flaw directly maps to CWE-284, which addresses improper access control vulnerabilities in software systems where authorization mechanisms are insufficiently enforced or bypassed through malformed inputs. The high complexity level associated with exploitation indicates that while the vulnerability exists, attackers must overcome significant technical hurdles to successfully compromise the system, though the public availability of exploit code reduces this barrier.
The operational impact of this vulnerability extends beyond simple unauthorized access, potentially enabling attackers to manipulate communication channels, access sensitive information, or disrupt service availability within the hermes-agent ecosystem. Given that this is a gateway authorization component, successful exploitation could compromise the entire communication infrastructure that relies on SimpleX protocols for secure messaging and data transmission. The fact that a patch has been identified with commit hash 490c486ff65b766d9de0fe0e6f26e1778aaa8fb3 indicates that the vendor has recognized the severity of this issue and provided a remediation path. However, the public availability of exploitation tools means organizations must urgently apply this patch to prevent potential compromise.
Organizations should immediately implement the provided patch to address this vulnerability while also considering additional mitigations such as network segmentation to limit access to the affected component, implementing additional authentication layers, or monitoring for suspicious contactId parameter usage patterns. The ATT&CK framework categorizes this type of vulnerability under privilege escalation and credential access techniques where attackers leverage authorization bypasses to gain elevated system privileges. Security teams should conduct thorough penetration testing to identify any potential exploitation attempts and ensure that all instances of the hermes-agent software have been updated with the latest security patches. This vulnerability demonstrates the critical importance of proper input validation and authorization checks in gateway and communication systems, as these components often serve as primary attack vectors in modern cyber campaigns targeting enterprise infrastructure.