CVE-2026-106620: ColdFusion Authorization Bypass Vulnerability

CVE-2026-106620 Overview

Adobe ColdFusion contains an incorrect authorization vulnerability [CWE-863] that enables a low-privileged attacker to bypass security controls and gain unauthorized write access. The flaw is exploitable over the network without user interaction and causes a scope change, meaning impact extends beyond the vulnerable component. Successful exploitation compromises confidentiality and integrity of resources the attacker would not normally reach.

Critical Impact

An authenticated attacker with low privileges can bypass authorization checks remotely, obtain unauthorized write access, and affect resources outside the vulnerable component's security scope.

Affected Products

• Adobe ColdFusion (refer to the vendor advisory for impacted versions)
• See Adobe ColdFusion Security Advisory APSB26-144 for the complete list

Discovery Timeline

• 2026-10-13 - CVE-2026-106620 published to the National Vulnerability Database
• 2026-10-14 - Entry last modified in NVD

Technical Details for CVE-2026-106620

Vulnerability Analysis

The vulnerability resides in ColdFusion's authorization logic. The server fails to correctly validate whether the authenticated principal is permitted to perform a requested write operation. An attacker with low-privilege credentials can submit crafted requests that are evaluated against incomplete or incorrect authorization rules, bypassing the intended security feature.

Because the issue triggers a scope change, the attacker can influence resources managed outside the vulnerable component's trust boundary. This expands the blast radius beyond the ColdFusion application itself to downstream systems or shared infrastructure that trust ColdFusion's enforcement decisions.

Root Cause

The root cause maps to CWE-863 Incorrect Authorization. ColdFusion performs an authorization check that does not accurately reflect the privilege required for a protected action. The decision logic approves requests that should be denied, enabling a security feature bypass without exploiting any memory corruption or injection flaw.

Attack Vector

Exploitation requires network access to the ColdFusion server and valid low-privileged credentials. No user interaction is needed. The attacker sends crafted requests to privileged endpoints or operations that should reject their role, and the authorization layer incorrectly permits write access. See the Adobe security advisory for technical specifics.

No verified proof-of-concept code is publicly available at the time of publication.

Detection Methods for CVE-2026-106620

Indicators of Compromise

• Unexpected write operations, file uploads, or administrative changes performed by low-privilege ColdFusion accounts
• Access to ColdFusion Administrator or protected endpoints from accounts without historical administrative activity
• New or modified .cfm, .cfc, or configuration files on the ColdFusion server outside normal deployment windows
• Outbound connections initiated by the ColdFusion process to unfamiliar hosts following suspicious authenticated requests

Detection Strategies

• Baseline authenticated ColdFusion sessions and alert on privilege-sensitive actions executed by non-administrative roles
• Correlate web server access logs with ColdFusion application logs to identify authorization decisions that approved writes from low-privilege users
• Deploy web application firewall rules that flag requests to administrative URIs when the authenticated role does not match expected privilege tiers

Monitoring Recommendations

• Enable verbose authentication and authorization logging in ColdFusion and forward logs to a centralized analytics platform
• Monitor file system integrity on ColdFusion web roots, cfusion/lib, and scheduled task directories
• Alert on process creation anomalies spawned by the ColdFusion JVM, including shell interpreters and scripting binaries

How to Mitigate CVE-2026-106620

Immediate Actions Required

• Apply the security update referenced in Adobe advisory APSB26-144 to all ColdFusion instances
• Audit ColdFusion user accounts and remove or disable unused low-privilege credentials that could be leveraged for exploitation
• Restrict network reachability to the ColdFusion Administrator and internal management endpoints using firewall or reverse proxy controls

Patch Information

Adobe published fixes in the ColdFusion Security Advisory APSB26-144. Administrators should consult the advisory for exact fixed version numbers and installation guidance for each supported ColdFusion release.

Workarounds

• Place ColdFusion behind a reverse proxy that enforces strict authentication and allow-lists only required URIs
• Enforce least-privilege role assignments and rotate credentials for any accounts that could be used by an attacker with low-privilege access
• Lock down file system permissions on ColdFusion web roots to prevent write operations by the ColdFusion service account where feasible

# Example: restrict access to ColdFusion Administrator via nginx
location /CFIDE/administrator/ {
    allow 10.0.0.0/8;      # internal management network only
    deny all;
    proxy_pass http://coldfusion_backend;
}