CVE-2025-22862: Fortinet FortiOS Auth Bypass Vulnerability

CVE-2025-22862 Overview

CVE-2025-22862 is an Authentication Bypass Using an Alternate Path or Channel vulnerability (CWE-288) affecting Fortinet FortiOS and FortiProxy products. This flaw exists within the Automation Stitch component, specifically in how Webhook actions are processed. An authenticated attacker with existing access to the affected system can exploit this vulnerability to elevate their privileges by triggering a malicious Webhook action, potentially gaining unauthorized access to sensitive functions and configurations.

Critical Impact

Authenticated attackers can escalate privileges through the Automation Stitch component's Webhook functionality, potentially gaining administrative control over FortiOS and FortiProxy deployments.

Affected Products

• Fortinet FortiOS versions 7.4.0 through 7.4.7, 7.2.0 through 7.2.11, 7.0.6 and above
• Fortinet FortiProxy versions 7.6.0 through 7.6.2, 7.4.0 through 7.4.8, all 7.2 versions, 7.0.5 and above

Discovery Timeline

• October 2, 2025 - CVE-2025-22862 published to NVD
• October 15, 2025 - Last updated in NVD database

Technical Details for CVE-2025-22862

Vulnerability Analysis

This vulnerability represents an authentication bypass through an alternate path or channel within Fortinet's security appliances. The flaw resides in the Automation Stitch component, a feature designed to automate security responses and administrative tasks. When processing Webhook actions, the component fails to properly validate the authorization level of the requesting user, allowing authenticated users with lower privileges to execute actions that should require elevated permissions.

The local attack vector indicates that exploitation requires existing authenticated access to the FortiOS or FortiProxy system. However, once an attacker has this foothold, they can abuse the Webhook action mechanism to bypass normal authorization checks and escalate their privileges. This could allow a low-privileged administrator or user to gain full administrative control over the security appliance.

Root Cause

The root cause of CVE-2025-22862 is an improper authorization validation mechanism within the Automation Stitch component when handling Webhook actions. The system fails to adequately verify that the authenticated user has sufficient privileges to trigger certain Webhook operations. This creates an alternate execution path that bypasses the normal privilege verification process, enabling privilege escalation.

Attack Vector

The attack requires local authenticated access to the FortiOS or FortiProxy management interface. An attacker with valid credentials (even low-privileged ones) can craft and trigger a malicious Webhook action through the Automation Stitch feature. The Webhook processing code does not properly enforce privilege boundaries, allowing the attacker's request to execute with elevated permissions.

The exploitation flow involves:

1. Gaining authenticated access to the affected FortiOS or FortiProxy system with any valid credentials
2. Navigating to or interacting with the Automation Stitch configuration interface
3. Creating or modifying a Webhook action with malicious parameters designed to bypass authorization
4. Triggering the Webhook to execute privileged operations that should be restricted to higher-level administrators

Due to no verified code examples being available for this vulnerability, readers should consult the Fortinet Security Advisory for detailed technical specifications and remediation guidance.

Detection Methods for CVE-2025-22862

Indicators of Compromise

• Unexpected or unauthorized modifications to Automation Stitch configurations or Webhook actions
• Log entries showing Webhook executions initiated by users who should not have administrative privileges
• Unusual privilege changes or new administrative accounts created without proper authorization workflow
• Audit logs indicating access to restricted configuration areas by lower-privileged accounts

Detection Strategies

• Monitor FortiOS and FortiProxy audit logs for Automation Stitch and Webhook-related activities, particularly those initiated by non-administrative users
• Implement alerting on any modifications to Automation Stitch configurations or newly created Webhook actions
• Review user privilege assignments regularly and flag any unauthorized escalations
• Deploy SentinelOne Singularity to detect anomalous behavior patterns associated with privilege escalation attempts on network security appliances

Monitoring Recommendations

• Enable comprehensive logging for all Automation Stitch component activities on affected FortiOS and FortiProxy devices
• Configure SIEM integration to correlate Webhook execution events with user privilege levels
• Establish baseline behavior for administrative actions and alert on deviations
• Regularly audit user accounts and their assigned privileges to detect unauthorized changes

How to Mitigate CVE-2025-22862

Immediate Actions Required

• Review the Fortinet Security Advisory FG-IR-24-385 for specific patch information and upgrade to a fixed version
• Audit all existing Automation Stitch configurations and Webhook actions for unauthorized or suspicious entries
• Review and restrict user access permissions, applying the principle of least privilege to all administrative accounts
• Enable enhanced logging and monitoring for the Automation Stitch component until patches are applied

Patch Information

Fortinet has released security updates to address this vulnerability. Administrators should consult the official Fortinet Security Advisory for the specific fixed versions of FortiOS and FortiProxy. It is critical to upgrade to a patched version as soon as possible to eliminate the privilege escalation risk.

Workarounds

• Restrict access to the Automation Stitch configuration interface to only highly trusted administrators
• Temporarily disable Webhook actions in Automation Stitch configurations if not operationally required
• Implement network segmentation to limit access to FortiOS and FortiProxy management interfaces
• Apply strict role-based access controls to minimize the number of users with any level of administrative access

# Review Automation Stitch configurations
config system automation-stitch
    show
end

# Audit existing Webhook actions
config system automation-action
    show
end

# Restrict management access to trusted networks only
config system interface
    edit "mgmt"
        set allowaccess https ssh
        set trusthost1 10.0.0.0/24
    next
end