CVE-2026-48318: Adobe ColdFusion Path Traversal Flaw

CVE-2026-48318 Overview

Adobe ColdFusion contains a path traversal vulnerability [CWE-22] that allows attackers to read arbitrary files outside the intended access scope. The flaw affects Adobe ColdFusion 2023 (through Update 21) and Adobe ColdFusion 2025 (through Update 10). An authenticated attacker with low privileges can send crafted requests over the network to access sensitive files on the underlying file system. Exploitation requires no user interaction, and the vulnerability results in a scope change that impacts resources beyond the vulnerable component. Successful exploitation exposes configuration files, credentials, source code, and other sensitive artifacts stored on the server.

Critical Impact
An authenticated remote attacker can read arbitrary files from the ColdFusion server, exposing credentials, application source code, and system configuration data across security boundaries.

Affected Products

Adobe ColdFusion 2023 (base release through Update 21)
Adobe ColdFusion 2025 (base release through Update 10)
Any ColdFusion instance exposing administrative or application endpoints to untrusted networks

Discovery Timeline

2026-07-14 - CVE-2026-48318 published to NVD
2026-07-15 - Last updated in NVD database

Technical Details for CVE-2026-48318

Vulnerability Analysis

The vulnerability stems from improper limitation of a pathname to a restricted directory within ColdFusion request handling. When user-supplied input is used to construct file paths, the server fails to canonicalize or validate the resulting path against an allowlist of permitted directories. Attackers exploit this weakness by injecting traversal sequences that resolve outside the intended web root or application scope.

Because the flaw enables reading files across trust boundaries, the impact extends beyond the ColdFusion process itself. Retrieved files can include neo-security.xml, password.properties, datasource configuration, and application source code containing hardcoded secrets. These artifacts frequently enable follow-on attacks such as administrative account takeover or lateral movement.

Root Cause

The root cause is insufficient input validation in file-handling routines that accept path components from HTTP requests. The affected code does not enforce a canonicalized base directory check before opening files, allowing sequences such as ../ or absolute path substitution to escape the intended directory.

Attack Vector

An attacker sends a specially crafted HTTP request to a vulnerable ColdFusion endpoint. The request supplies a manipulated path parameter that traverses outside the application directory. The server processes the request, opens the resolved file, and returns its contents to the attacker. Low-privileged authentication is required, but no user interaction is needed.

No verified public proof-of-concept code is available. Refer to the Adobe ColdFusion Security Advisory APSB26-82 for vendor-provided technical details.

Detection Methods for CVE-2026-48318

Indicators of Compromise

HTTP requests containing path traversal sequences such as ../, ..%2f, ..%5c, or encoded null bytes targeting ColdFusion endpoints
Unexpected read access in ColdFusion logs to files outside the cfusion/wwwroot directory, particularly neo-*.xml and password.properties
Anomalous outbound responses containing configuration data or source code returned from ColdFusion application URLs
Authentication events from low-privileged accounts immediately followed by access to administrative resources

Detection Strategies

Inspect web server and ColdFusion application logs for URL-encoded traversal patterns in query strings and POST bodies
Deploy web application firewall rules that decode nested URL encoding before evaluating path parameters
Correlate authenticated session activity with file system access patterns to identify accounts reading sensitive configuration files
Baseline normal file access behavior for the ColdFusion service account and alert on deviations

Monitoring Recommendations

Enable verbose request logging on ColdFusion administrative interfaces and forward events to a centralized SIEM
Monitor file integrity for neo-security.xml, password.properties, and other files containing secrets
Alert on any read access to ColdFusion configuration directories originating from web-facing processes
Track authentication failures and successful low-privilege logins that precede unusual file access

How to Mitigate CVE-2026-48318

Immediate Actions Required

Apply the Adobe security updates referenced in APSB26-82 to ColdFusion 2023 and ColdFusion 2025 without delay
Restrict network access to the ColdFusion Administrator and internal application endpoints using firewall rules or reverse-proxy allowlists
Rotate credentials, API keys, and datasource passwords that may have been exposed through arbitrary file reads
Audit ColdFusion accounts and remove or disable low-privileged accounts that are not required

Patch Information

Adobe has released fixed builds for ColdFusion 2023 and ColdFusion 2025. Administrators should install the versions specified in the Adobe ColdFusion Security Advisory APSB26-82 and validate the update by checking the ColdFusion Administrator version banner after deployment.

Workarounds

Place ColdFusion behind a web application firewall configured to block path traversal payloads and normalize URL encoding
Enforce the ColdFusion lockdown guide recommendations, including running the service as a least-privileged OS account
Remove world-readable permissions on ColdFusion configuration files where operationally feasible
Disable or restrict unused ColdFusion components and endpoints that accept file path parameters

bash

# Example WAF rule pattern to block common traversal sequences targeting ColdFusion
# (adapt to your WAF syntax)
SecRule REQUEST_URI|ARGS "@rx (\.\./|\.\.%2f|\.\.%5c|%2e%2e/|%2e%2e%5c)" \
  "id:1002026,phase:2,deny,status:403,log,msg:'ColdFusion path traversal attempt (CVE-2026-48318)'"